Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac0cfa8defe51d8f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 23:02:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4c4e0a364343167567ade7024050450d SHA-1: 7846204938bfe7eb8d7642acef233976a24edef8 SHA-256: ac0cfa8defe51d8fa6f2a564f8417969f3f0d04554eef799de85f9d377f752f9
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent URL pointing to a site offering 'autocad 2012 64bit free with crack', suggesting a lure for pirated software. The PDF structure also indicates it functions as a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/123?utm_term=autocad+2012+64bit+free++with+crack PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4370309/normal_5fe0d55f93167.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_6017b92a54a24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489853/normal_5fd3417693b48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474176/normal_601f536a9b312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465703/normal_604f791d6b542.pdfIn PDF document text
    • http://dudupikitum.iblogger.org/coordinating_conjunctions_exercises.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380675/normal_6032bc191f614.pdfIn PDF document text
    • http://esclub.pro/how_to_get_unlimited_spins_in_coin_master_without_human_verification4uh1o.pdfIn PDF document text
    • http://sks-expertiza.ru/75448653792omxta.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404755/normal_5fe2d8331f348.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/303745a9-fc78-4425-99ac-77064e9b5a34/24374675603.pdfIn PDF document text
    • https://s3.amazonaws.com/fadadedezeker/woguxenavazozuwuzorega.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1497d59-5ac5-4716-bbbf-cbcdfea0e369/28077817200.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ff87f364-1d50-4a22-ad37-7db94b334839/gagejelegunawefiluzun.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/burger_king_allergenek.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/how_to_find_average_speed_in_physics_without_distance.pdfIn PDF document text
    • http://podixevobelataw.rf.gd/jozipilow.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_off0000f3b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B5 5752 bytes
SHA-256: 08bbd122b565d9ceba018d3b6ec0e27293b8eab1d97a43f1b10fee8d007c1e90
font_01_sfnt_off00010763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10763 11048 bytes
SHA-256: 6c9162b17b4f6de51c105cb5e03585b8d771c876147ae5d68a2288a5b0c1cc65

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