Malicious PDF — malware analysis report

Static analysis result for SHA-256 5330c1c08d0efd0c…

MALICIOUS

PDF

97.5 KB Created: 2021-03-22 14:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 0d0245aad1c6f7a282423bd99a5dc355 SHA-1: 40ea3cba2c209cc11a98804e22b5a7d7bd67efba SHA-256: 5330c1c08d0efd0ca0b4ae485cec228cd7e27cd7f25cbffc31c2e65c7a8aa9eb
126 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, with a notable one pointing to 'nipisod.ru', suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this by indicating the PDF acts as a link farm on disposable hosting, likely to obscure the true malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/wix?keyword=sadie+the+goat+drunk+history PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4375353/normal_5ff7f0604566f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467564/normal_604b24fcae284.pdfIn PDF document text
    • http://ourfanz.com/1967_ford_mustang_shelby_gt500_for_sale_australia0aghz.pdfIn PDF document text
    • https://cdn.sqhk.co/wazilisiko/hco1jhM/bangla_natok_short_funny_video.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_6057eeee461b2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413370/normal_6046f03e96670.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420468/normal_5ff0b96fb50b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417675/normal_604ef24533b3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413118/normal_600969fc7dc1f.pdfIn PDF document text
    • http://solapp.xyz/31333382581b3e7r.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/jciaDhd/townsmen_ios_guide.pdfIn PDF document text
    • http://hushseo.online/849493529894rxug.pdfIn PDF document text
    • https://cdn.sqhk.co/letonolomo/gg8Ghak/archbishop_stepinac_high_school_uniform.pdfIn PDF document text
    • https://cdn.sqhk.co/netimupoxojo/egi1zjb/22392593468.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/pajeriramal/critical_ops_ios_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/113626663.pdfIn PDF document text
    • https://s3.amazonaws.com/farokof/website_templates_for_book_sales.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d4028e48-47ab-4ed8-a1b8-f1157a6025b0/how_to_find_the_volume_of_a_cone_in_terms_of_pi.pdfIn PDF document text
    • https://s3.amazonaws.com/galinikagopit/king_of_majesty_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bfa7ca6-0f10-4eb9-8191-4be3a641ff58/pajuziliwudegemupevalet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f77a4c53-bda2-4c9a-8a5c-b8c5982db352/24267371770.pdfIn PDF document text
    • https://s3.amazonaws.com/buwosevax/vadasejevejomegepotaxa.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_off00013df5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DF5 5324 bytes
SHA-256: c02225efc9264ad1faa9186067892ddf52c718c0c15bb22c1d032eefccf2bb64
font_01_sfnt_off0001500f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1500F 12636 bytes
SHA-256: 82111943735695191caa4ee2cb527a4a6d4f7d19f6e9fe0195a8399bd9165009

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