Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5e158fd2975c3d…

MALICIOUS

PDF

85.1 KB Created: 2021-04-29 12:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 09695e1b62a72b7e0ecbdcea1d3c728f SHA-1: 874bf26867c2ac8614b2a75243a5647a271545cb SHA-256: cb5e158fd2975c3dd2d8de555d358b40671918b0c439f164d3bd486ba0bab229
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+wear+tissot+1853+watch PDF link annotation
    • https://rotutipugav.weebly.com/uploads/1/3/4/7/134750083/tukonopefaj.pdfIn PDF document text
    • https://semoligi.weebly.com/uploads/1/3/0/9/130969118/zewoxajarena.pdfIn PDF document text
    • https://bikugepoxo.weebly.com/uploads/1/3/5/3/135351236/ec5381b39ed9a12.pdfIn PDF document text
    • https://dajepulexito.weebly.com/uploads/1/3/4/5/134591334/tigegusifokalaboxoba.pdfIn PDF document text
    • https://tewazaxapij.weebly.com/uploads/1/3/4/8/134873756/wifiruxokejaparevaj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9c8f49e5-5895-4656-bc53-c560b1a0ede3.filesusr.com/ugd/0f7a6f_155a33d2c9084a629586d8b417367564.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f1b0399-18f6-49c5-b162-248575354f8a/38980736429.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebce0548-4fef-4e5d-90f4-6c9fd6cb8e02/warcraft_2_heal_units.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_49fa89e2799f4091b9e324fe800c0af9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15b636d0-9f3a-4f5e-b881-fd146f3c59cb/bopusuvor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94d619c6-70c1-4d4c-b737-e0859ad0c732/what_is_critical_thinking_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c81f9017-7ae3-4df1-b9a9-ebd5f6fde612/yaskawa_j1000_manual_trke.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04e5b8c4-c03b-4bbb-a133-0fc33bf07932/9398174913.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2664f5cc-33b5-4b0e-8a64-39782b427302/petsafe_wireless_dog_fence_3_4_acre.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/650d2460-d7c1-427e-816c-bcbdf23babf4/36138843248.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b586d22f-2530-4fb7-9662-7a4e3c1ddf7c/tetiralopi.pdfIn PDF document text
    • https://71a0d42b-91d5-4e94-9338-ff69ca8a624b.filesusr.com/ugd/e5d5e5_302f880b82054f5cb6a95c1490e29d41.pdf?index=trueIn PDF document text
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_6a630aed453748d288eb5cffe895c766.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b940a15b-b79a-435e-9317-9cc62fc138d3/stihl_bg_86_spark_plug_champion.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e765f7d-590d-47d4-88f6-10e82d39712e/38588234036.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3378ed88-a337-48eb-9021-ad6cf1998c5d/kabadetasawubavuwejeduxim.pdfIn PDF document text
    • https://e5b7f393-9b83-42c5-a877-5b85c0c772c8.filesusr.com/ugd/77b42d_aa4bb687b4c241e596e041c8fa09a909.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52c5d93b-39f2-4715-92c0-e0ac5f501d6e/applescript_do_shell_script_multiple_lines.pdfIn PDF document text
    • https://6b137298-3864-41c5-aaa3-11744000c3c2.filesusr.com/ugd/b916f4_4401efbb6aa54478a444e3cb251aaf6a.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010e39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E39 5444 bytes
SHA-256: af974eeb3d1e3763959f81468218f29fd1334ec5f326807d6b928ed5d30a990f
font_01_sfnt_off000120d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120D1 11384 bytes
SHA-256: 24ae6dc2d57322b73fa2d8d06f4eaf7b20d8435aa6997fd07d5051c3cc18b1f1

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