Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd1b0f5a6a9e7e73…

MALICIOUS

PDF

77.6 KB Created: 2021-03-15 04:31:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8452de029cdca98a43174e9b8c77ac45 SHA-1: e4a580ccf901d325c9a845d8ffc9b1ca5ad4b145 SHA-256: dd1b0f5a6a9e7e734e4e3a1fd508b2ebe6eb0add815852f9b072ac65c95df22c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 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.
  • 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://mezovuduw.ru/123?utm_term=dungeon+fighter+online+quest+guide PDF link annotation
    • https://cdn.sqhk.co/duloputemab/jihhLhd/rugirusi.pdfIn PDF document text
    • https://cdn.sqhk.co/navimoxa/fb3AidR/61918796437.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382003/normal_602ee5ade176a.pdfIn PDF document text
    • http://igcopyrightclient.com/add_2e_cleric_spellsa6yd1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501501/normal_6041762a5976d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480744/normal_5ffeb851e67f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502819/normal_6004c62f157fc.pdfIn PDF document text
    • http://trelon.fun/bubifejimizukomirasene4vt58.pdfIn PDF document text
    • http://henrysavbr.site/mozepuq2d8p.pdfIn PDF document text
    • http://varietystore.website/zombies_2_costumes_wynters0p26.pdfIn PDF document text
    • https://cdn.sqhk.co/pazaxefuma/kiazHu0/69013602990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/viwoxuz/nokenox.pdfIn PDF document text
    • https://s3.amazonaws.com/ropuba/91394109458.pdfIn PDF document text
    • https://s3.amazonaws.com/fumiposamisur/najidokakolar.pdfIn PDF document text
    • https://s3.amazonaws.com/futamo/anywhereusb_2_software.pdfIn PDF document text
    • https://s3.amazonaws.com/muvarelo/joxiredi.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_97888a78c9b44e8184c8a1866b88b53b.pdf?index=trueIn PDF document text
    • https://7d7e9a41-1eea-4c72-a0b8-c0e3d642de37.filesusr.com/ugd/513cfa_aa1c6aa0d90341afbf93b0931f706e1b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zatasipezeg/osrs_arceuus_library_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/befarekogol/barangay_143_episodes.pdfIn PDF document text
    • https://s3.amazonaws.com/zijivevip/64811119265.pdfIn PDF document text
    • https://3c86e5df-9a55-47dd-9d5b-c207b25ec6cd.filesusr.com/ugd/72bf36_56e4df9b2d44456584d79efcf5980c83.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vudivuzakal/91963655305.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_8b7983fff79c4acfaff89aabe8ec2033.pdf?index=trueIn PDF document text
    • https://11f44e1d-c86f-4be6-baa1-90970e7c24f5.filesusr.com/ugd/a298ce_8c14f9b97e02489c83f1f388a1041e58.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/bijofuwot.pdfIn 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_off0000f13d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13D 5084 bytes
SHA-256: f166600ec17c14fc170eb12d62c6714e73b0c4f1ac79e2f183a3c3117f54c3f7
font_01_sfnt_off00010285.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10285 11188 bytes
SHA-256: 88cbcf813f22e054587296c73ba647223812cc0a30d279a81c4a0f89a6f3c2d0

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