Malicious PDF — malware analysis report

Static analysis result for SHA-256 219cf6840013750f…

MALICIOUS

PDF

76.8 KB Created: 2021-06-09 04:16:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1165cc5b8c7cd2fb1a9fe479597824d1 SHA-1: b3f023713edd1c68c57cd96ab5be50bbd336947d SHA-256: 219cf6840013750f164a4561081a97a1905ea7b1d9ddd70786904d0768453b41
126 Risk Score

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 0.9998

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://archism.ru/pbw?utm_term=test+2+reading+passage+2+answers PDF link annotation
    • https://punadojum.weebly.com/uploads/1/3/2/6/132680976/6669760.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479942/normal_5fc9054b34da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485176/normal_5fdb93f3c396f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456998/normal_603e0ea0e9420.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372723/normal_600f3b3e5e1e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477386/normal_600c203f4fa8b.pdfIn PDF document text
    • https://bupuzufemu.weebly.com/uploads/1/3/1/4/131452870/pejutosusebof-nuxutaleva-sebomope.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4498994/normal_5fcbcfa7bb51a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dusozivelas.pbworks.com/w/file/fetch/144915291/bhagavad_gita_marathi_download.pdfIn PDF document text
    • http://gexufak.pbworks.com/f/how_did_zeus_defeat_the_titans.pdfIn PDF document text
    • http://safopiluzaw.pbworks.com/f/naruto_mod_c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9eec1a3a-0130-4279-959d-368b215da971/the_crown_season_4_episode_10_historical_accuracy.pdfIn PDF document text
    • http://lekipirunezi.pbworks.com/w/file/fetch/144415644/31528921437.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59e457b4-cf3f-43c8-8868-8aa24dbb97f8/60617010049.pdfIn PDF document text
    • http://fijinatuzut.pbworks.com/w/file/fetch/144717237/51654209563.pdfIn PDF document text
    • http://vawijoj.pbworks.com/w/file/fetch/144472848/hope_you_have_a_great_weekend_answer.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_off0000ef69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF69 5268 bytes
SHA-256: e2aa63fa827ace0a39ad0621e6f1ecb50c40f9a76332aecc0dc7a64e7e4f2541
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10876 bytes
SHA-256: bd355c8c03bc9a03e12eafe674f8b1f8f22437195efba5481d132bbc3c14afdb