Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5281facda06180f…

MALICIOUS

PDF

83.3 KB Created: 2021-03-14 05:16:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5859ffda988d6b04bde0533de530bce0 SHA-1: 1bfef6d4ecb0ac48a81734c36199cfff554adcc8 SHA-256: a5281facda06180f3a7dc71fbc1e81669d35d49b629b2db83f9533f2092d97e4
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9954

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=alastair+reynolds+house+of+suns+pdf PDF link annotation
    • https://cdn.sqhk.co/xivijela/fqhcjgT/24979603166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460709/normal_602e7f51ef6a5.pdfIn PDF document text
    • https://cdn.sqhk.co/dopinaku/dmjahcz/44861189667.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409254/normal_5fe42e82607d3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495973/normal_601d067b4bca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379032/normal_60318fa80c386.pdfIn PDF document text
    • https://cdn.sqhk.co/pofoxubo/XdnqjhX/samsung_galaxy_s8_ringtone_folder.pdfIn PDF document text
    • http://zilakagu.22web.org/47862732963.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384310/normal_6017e0be5a055.pdfIn PDF document text
    • http://baramijotafexo.mypressonline.com/maximum_principal_stress_theory_factor_of_safety.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/fEWyA2Y/77207837232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_60225c7d87922.pdfIn PDF document text
    • https://cdn.sqhk.co/zumedizojas/iagjDjj/76137578508.pdfIn PDF document text
    • https://cdn.sqhk.co/nasubivapu/lfiageQ/zexixasos.pdfIn PDF document text
    • https://cdn.sqhk.co/lezenelu/7ribGih/26429773327.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385647/normal_6005c3542db14.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451018/normal_5ff6003d798da.pdfIn PDF document text
    • https://cdn.sqhk.co/dixufeja/jirhfcJ/egg_inc_wiki_missions.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_602d9807a89ad.pdfIn PDF document text
    • https://cdn.sqhk.co/tororukiwuri/dijSagf/dynamons_world_no_360.pdfIn PDF document text
    • http://xevusezes.medianewsonline.com/denon_avr_1312_service_manual.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://sadoboxijowem.myartsonline.com/bissell_steam_cleaner_1383.pdfIn PDF document text
    • http://fugufaza.myartsonline.com/29810216202.pdfIn PDF document text
    • http://gawuvuv.epizy.com/lifowuvedor.pdfIn PDF document text
    • http://kofadokajofej.epizy.com/lenaforumop.pdfIn PDF document text
    • http://fekuzigide.epizy.com/63777082715.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9B 5104 bytes
SHA-256: 7b9cc988bf3dce856a3bc25129f7663b73e022d6ffa65b8883860607465e9dd4
font_01_sfnt_off00010cec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEC 10724 bytes
SHA-256: 9c18e6ede2a18e7085cebd9f5407e7f06d562552222eaf34786024a3c7a514c0
font_02_sfnt_off000131a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A5 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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