Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4d90d26d389f0d…

MALICIOUS

PDF

72.8 KB Created: 2021-03-18 19:27:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: becc4d50e26be0ea6c930c45fbda12ca SHA-1: 691e88ee13915d902af5ffab9b2a962a91d84135 SHA-256: ca4d90d26d389f0d60cd61003c2b94b160f6707a9829645cb607296a1b425898
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a significant number of external links, many pointing to disposable hosting, indicative of a link farm designed to obscure malicious destinations. The presence of a 'download button' lure and ClamAV detection further supports a malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the overall structure and URL patterns suggest a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://leonvi.ru/123?utm_term=visiting+card+design+online+cdr+free PDF link annotation
    • https://cdn.sqhk.co/moxibusas/Zidhe0E/52223290118.pdfIn PDF document text
    • https://cdn.sqhk.co/wafasojudo/hahi5iI/rollercoaster_rush_java_game_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://e082b6be-64c0-45f6-a8ff-82b9c6f476f0.filesusr.com/ugd/1479de_b0d6518407da4eb4b6372d70cb294f17.pdf?index=trueIn PDF document text
    • https://989244f3-426d-4557-b4f1-0018dac9047c.filesusr.com/ugd/57c819_0c2d93d7f44f4d2592b52ea6d64ef060.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/77841cc3-62b1-4f9a-b709-0cccd1f0860f/fedex_store_fairmont_wv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/026274ed-4135-4408-a1d0-8a95e4e62e84/13157058353.pdfIn PDF document text
    • https://s3.amazonaws.com/sigobija/multiplying_and_dividing_polynomials_practice_worksheet.pdfIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_02648f825a7a4df39f6fa66382e1faea.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a33aeab9-5fbb-490a-ad58-0df24f08414a/penguin_chick_story.pdfIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_7e4f9ac53c3b42f59ff8ef82337c751a.pdf?index=trueIn PDF document text
    • https://e06e8306-d71e-4c92-aa1b-e8c52eeb44cb.filesusr.com/ugd/bc4951_a1c1f86f84a940c88af38a5e1fb1598a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/99bdc291-e98f-49c2-9d80-181a4b9f1d9b/why_did_the_trojans_accept_the_wooden_horse.pdfIn PDF document text
    • https://s3.amazonaws.com/xepululejiwof/wovegofe.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_f06105e5367d45f29c5fe29223606765.pdf?index=trueIn PDF document text
    • https://bd7a0a6f-bbfd-49cc-ba41-c3f2778102d9.filesusr.com/ugd/9ea91e_c36031002a8149aaa431b48f39707008.pdf?index=trueIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_8d06ce36d0d94cd4aaa6a06e4b8a0b81.pdf?index=trueIn PDF document text
    • https://c7bff75e-0a19-4817-9d47-fca4cf08161b.filesusr.com/ugd/3b6424_1b992847016d489f9af4dc360cf1ffa8.pdf?index=trueIn PDF document text
    • https://5548a280-a194-4776-8019-0e256783c1fa.filesusr.com/ugd/f2c1dc_f1a27472632440a78ec04f7c9ae96291.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wovigebi/wilesadelejaz.pdfIn PDF document text
    • https://98cdd5c5-c43e-49eb-9373-39517e896cbb.filesusr.com/ugd/90661f_f4e1553805614c2e880ca7a950e23552.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/zenuz.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/dizepewepimafoxumapejo.pdfIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_0ae357d335924dc589fbbb2ae0c4038f.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d36c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36C 4944 bytes
SHA-256: 08e5845cfed08ab9bef7960291f602d03ff05f9ff5e4658d44f9458b9d8015a9
font_01_sfnt_off0000e43f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE43F 10220 bytes
SHA-256: 8c33d9502de1aa79571862d6a7a65c1bd998ad58faa18d8c3adc3ff75ac03ebb
font_02_sfnt_off00010739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10739 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

Open this report in the interactive analyzer, or submit your own file for analysis.