Malicious PDF — malware analysis report

Static analysis result for SHA-256 3bbff50a00e20bdb…

MALICIOUS

PDF

77.6 KB Created: 2021-04-24 01:08:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a9401efb830826c9a97ce342dd2fa916 SHA-1: 9d51af88b6e41eed061788310dbedd87eb32aa2c SHA-256: 3bbff50a00e20bdb630eca2d0cb7296e10e5e6e5b3120ed79323648f05525b52
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 0.9989

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://ponafet.ru/strik?utm_term=how+to+prepare+for+teacher+assistant+interview PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417308/normal_602753f101747.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_60192c1159495.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff9cfd4b635f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416490/normal_5fc7b8f900f38.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490720/normal_5fe0d90d6abb5.pdfIn PDF document text
    • http://nifajukopo.iblogger.org/75584450015.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_6063e6f58dbc6.pdfIn PDF document text
    • http://losqutoq.online/39874405806lqg1z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_603f3c01c41a2.pdfIn PDF document text
    • http://hytri.com/624375026144y0bt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472216/normal_60669f16872c3.pdfIn PDF document text
    • http://sosed.market/what_happens_if_too_much_solvent_is_used_for_recrystallizationdk5jr.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391317/normal_5fe9a8b23221c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454668/normal_5fd62fb8b5494.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_6038223f7bc58.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485693/normal_600efb7c2318b.pdfIn PDF document text
    • http://tacfitproducts.com/75589212520pz0mg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479460/normal_6047d6c1ee6c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382421/normal_6061ea42d7cc6.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://takerowul.epizy.com/budgeting_and_financial_administration.pdfIn PDF document text
    • http://busimutu.epizy.com/25561523480.pdfIn PDF document text
    • http://wivifizurata.epizy.com/should_ai_be_used_in_healthcare.pdfIn PDF document text
    • http://xavemiwikujuxuk.rf.gd/buderus_gb142-_60_installation_manual.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_off0000e589.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE589 4972 bytes
SHA-256: 32e1b60245df9b6aaf8973d039fbe7143e694ff97066229dd176854ed772ca0e
font_01_sfnt_off0000f675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF675 10672 bytes
SHA-256: e4ca70ebab72a1b44cb480798a385ca2f09286ed1bfa4f99dcb03abe0bbf0689
font_02_sfnt_off00011aa6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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