Malicious PDF — malware analysis report

Static analysis result for SHA-256 df17238e13d9a1f4…

MALICIOUS

PDF

79.6 KB Created: 2021-04-07 22:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 9f6d7a51be785abe27554bb5208766c3 SHA-1: 954ba1dfb0b3d599eb8d3fea693c93bfbba1bc85 SHA-256: df17238e13d9a1f4fa94ab9113c0587c320b46e3ff37752657d8cc9008a43b01
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 0.9995

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://bologen.ru/123?utm_term=aet+college+full+form PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366308/normal_602f0993ad6fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_602ff8bb78011.pdfIn PDF document text
    • http://blu-ital.space/2006_bmw_330i_screen_not_workingjh086.pdfIn PDF document text
    • http://kmikaerfs.ru/duretorunexopenijafufe4yf0s.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419633/normal_5fd18a5557bda.pdfIn PDF document text
    • http://morugufuvak.iblogger.org/somaxegoxububivemovemut.pdfIn PDF document text
    • http://wizagulonas.22web.org/dotodiwomava.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417525/normal_60555ad0633a7.pdfIn PDF document text
    • http://usesalle.xyz/how_many_calories_does_a_chicken_bowl_from_el_pollo_loco_havesdfk5.pdfIn PDF document text
    • http://xoluzezo.22web.org/21868769047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_6010f6ced0948.pdfIn PDF document text
    • http://barcaporirternet-interbank-pe.com/20385054748rls40.pdfIn PDF document text
    • https://cdn.sqhk.co/muwizavo/2Vjbajg/sinuxafozajoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463034/normal_60244115abc3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476783/normal_600e7d04c7249.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467278/normal_5fde3850b09f1.pdfIn PDF document text
    • https://cdn.sqhk.co/manizamo/hefkjfT/lullaby_for_babies_white_noise_online_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jozivunawitud.rf.gd/guvimezejosawobiduponi.pdfIn PDF document text
    • http://maxovizanopi.rf.gd/pepiru.pdfIn PDF document text
    • http://balifajaxi.epizy.com/lab_equipment.pdfIn PDF document text
    • http://kobuxeniduf.rf.gd/zoleva.pdfIn PDF document text
    • http://dafiwogi.rf.gd/family_history_of_breast_cancer_nice_guidelines.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e61e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE61E 4804 bytes
SHA-256: 466d379918edb29dce9eb19d5f2014554d916fbb8860499bc7167d096e78a4e1
font_01_sfnt_off0000f667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF667 11040 bytes
SHA-256: 0a452a788a22d4cc3a7fc743d78c3f68dc26da20b5a2eb6bb2d34c4057faeda6
font_02_sfnt_off00011bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB1 16164 bytes
SHA-256: c41fc46809d2260d2d1a821cef6bb00dae560fdbad380da94a93f29d012df54e

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