Malicious PDF — malware analysis report

Static analysis result for SHA-256 81a21bba38baf705…

MALICIOUS

PDF

84.0 KB Created: 2021-06-01 06:55:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f765b836d9b3ee2a6d29bb13ccdd12ec SHA-1: 11f2f2b1ef8d274d24e990df469844680ed6c740 SHA-256: 81a21bba38baf7052a5c0d3ff3466d5e0c6ce1c903cd20edde11068d2d9402e6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified by ML classifiers and ClamAV as malicious. The document body, though heavily obfuscated, suggests a lure related to 'Whatsapp messenger'. The presence of external links indicates an attempt to redirect the user to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=whatsapp+messenger+2.20.14+beta+apk
    • https://cdn-cms.f-static.net/uploads/4419628/normal_601420a376a32.pdf
    • https://static.s123-cdn-static-d.com/uploads/4477877/normal_60b0767d8f1d2.pdf
    • https://cdn-cms.f-static.net/uploads/4393044/normal_602624c2d5746.pdf
    • https://cdn-cms.f-static.net/uploads/4387815/normal_6027d9d7b1ef1.pdf
    • https://static.s123-cdn-static.com/uploads/4388050/normal_5ff545d638cdb.pdf
    • https://static.s123-cdn-static-d.com/uploads/4471682/normal_60b2c42ef2dda.pdf
    • https://cdn-cms.f-static.net/uploads/4388279/normal_5fd61b2e777bc.pdf
    • https://static.s123-cdn-static-d.com/uploads/4443325/normal_60b11ab9ada1f.pdf
    • https://lewebivaduxug.weebly.com/uploads/1/3/5/3/135392118/wunovu.pdf
    • https://zulewawasukuxu.weebly.com/uploads/1/3/4/5/134581955/gorafunejefuvonu.pdf
    • https://static.s123-cdn-static.com/uploads/4471484/normal_5ff277d4d066c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://mapijakemifo.pbworks.com/w/file/fetch/144431745/monodatuzefovelatot.pdf
    • http://palixazoke.pbworks.com/f/xolosu.pdf
    • http://zopujoxobug.pbworks.com/f/sulatutuzabunadugodujivi.pdf
    • http://muxopal.pbworks.com/w/file/fetch/144440454/innovation_and_entrepreneurship_exam_questions.pdf
    • https://uploads.strikinglycdn.com/files/714cb454-8362-4c6a-97ad-61be11286db3/5698151614.pdf
    • https://uploads.strikinglycdn.com/files/69a71ccd-f17d-4b48-863f-0bb976328713/ink_for_hp_deskjet_3050_wireless_printer_copier_scanner.pdf
    • https://uploads.strikinglycdn.com/files/53596cac-c16f-41d5-94cc-1137a0962a9c/fast_metabolism_diet_snacks_phase_1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000108c5.bin
800e9198f01a393dd3636c0fb7cd56c5009396686d0bfa018b9240163cabd6ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108C5 5864 bytes
font_01_sfnt_off00011cb3.bin
4a8a10c9ff6356485f68e8441c9d847c0aa4684c5e0d96a104c84f943778f380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB3 11220 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.