Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72c1bd4c77fe03b…

MALICIOUS

PDF

77.0 KB Created: 2021-04-02 09:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 36d1aade907aff88471e3ff27cb1ddad SHA-1: b239a0cb5ecfe7525d3600e829211457c9113db0 SHA-256: b72c1bd4c77fe03b9d91f6768494ecbbed17049f910f96d7c978e7b34e3787d7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/wix?keyword=civilization+5+apk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407306/normal_602e3400be9bc.pdfIn PDF document text
    • http://motivawka.online/jubomakugelivadukodibufobuug8z.pdfIn PDF document text
    • http://henrysavbr.site/gedoradulotileto0da7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_601af87c88e46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495271/normal_605b0ac8d547a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457572/normal_600082910df8e.pdfIn PDF document text
    • http://febiterozoz.medianewsonline.com/53362240843.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_601867c45779c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423195/normal_60168050ae251.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425483/normal_6007941911781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c36efdde-2309-4ce2-a10d-b6df2ce12cd8.filesusr.com/ugd/e98059_e7366cebd87e4b958db030a0c47bf8fd.pdf?index=trueIn PDF document text
    • http://doxokalisawe.myartsonline.com/active_listening_skills_exercises.pdfIn PDF document text
    • http://naxesabefadufu.atwebpages.com/arithmetic_functions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f86ab0cd-2800-475c-b8ef-d85facfa64a3/66229731897.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75d094f9-d714-4825-b6fd-4709e3208a82/graco_snugride_30_snugride_30_lx.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a800b08-7892-4b22-9ebf-e47034387715/monster_inc_meme_mike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5445ce20-8ff3-4142-b8a5-e2a8abddd472/66711942254.pdfIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_368c9df714654c3382fc9bdff1ed3cad.pdf?index=trueIn 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_off0000f0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D0 4744 bytes
SHA-256: aa3df0f218a409798d3c533e1824959e2514c91ea6f796502de3e44e1725c1ed
font_01_sfnt_off00010115.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10115 11168 bytes
SHA-256: 41fd3da17d05ad2112d3f2f7c6e61e4836d7e8a738ff05bedfc41a3d046c585c

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