Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8215038a4ffa769…

MALICIOUS

PDF

153.4 KB Created: 2021-04-04 05:17:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 97383f28454c43dbb9b0d09047b008e9 SHA-1: 6d50d18b9797d125f1e1d0ba9b2e50cb487ced49 SHA-256: f8215038a4ffa7691b60dc149fc47edad7b0419997690c7bab76ee6682d488b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were extracted, the PDF structure and embedded URIs are indicative of a malicious document, possibly leveraging a PDF exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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://leonvi.ru/award?keyword=matteo+bandello+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4449788/normal_60421e00826dd.pdfIn PDF document text
    • http://vwwv-avito.online/janome_new_home_mini_sewing_machine_manualmwm58.pdfIn PDF document text
    • http://study-english-05.site/the_little_book_of_valuationl7h3u.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/gogipuponifirokupiwegovav.pdfIn PDF document text
    • http://parhelifrl.space/5895971442b4tc8.pdfIn PDF document text
    • http://lotto-investclub.com/grand_master_of_shaolin_kung_fu_moviet4ug2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413587/normal_60117291b7592.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
    • http://zunotewa.rf.gd/zevuxovanofedutosere.pdfIn PDF document text
    • http://xedovafimolodem.epizy.com/kyoto_station_japan_guide.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_016defbb9fc14577af985caaaf26486c.pdf?index=trueIn PDF document text
    • https://02274cc9-8b57-4441-be19-e46c089ec46b.filesusr.com/ugd/f11b8f_73d0886dfe8d411f81feab0b1b33ca34.pdf?index=trueIn PDF document text
    • https://eb72eaa1-ef55-40a3-a653-f6d21bccf295.filesusr.com/ugd/54913d_c8958aef2a8042c588da0d9050bf5e69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/55e50178-0dfa-446b-974a-a6e53db9b548/73240392172.pdfIn PDF document text
    • https://b8f7bc2e-5f90-466c-a76c-b8215bfdb3ae.filesusr.com/ugd/9717d9_3f4db413992045c59f03f8eb836a3a13.pdf?index=trueIn PDF document text
    • https://065b66ee-25d8-4381-b309-094abc4d823c.filesusr.com/ugd/2703e6_d420a9b1cfc640f9ac5f97035f20a7c7.pdf?index=trueIn PDF document text
    • https://d7301f0f-9730-4f6e-9d95-601e203cb770.filesusr.com/ugd/253413_0c12e07ec24040a3aa78f1092271d635.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/30362aac-5da3-4c3e-af1d-0ba411b5a43a/download_divergent_sub_indo_480p.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_d2ce4744c4034ebfb59080f83d7cb756.pdf?index=trueIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_46d8d9a5bc3640f1823efa82dc135610.pdf?index=trueIn PDF document text
    • https://07e0a16e-b77d-475b-b724-88bbaedb347c.filesusr.com/ugd/8e9e2f_7af74d5eeb7b4594af5996c72f520215.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_off000204ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x204BA 4644 bytes
SHA-256: 23f434a78290d025db71e9edb969b3dbea1a657aa6d671a139077dd2b07af7d6
font_01_sfnt_off00021495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x21495 16496 bytes
SHA-256: 9d9ab91befd15bb60e56127d7ab8835f470c493fd1ef62f847078051625ebb32
font_02_sfnt_off0002471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2471D 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176