Malicious PDF — malware analysis report

Static analysis result for SHA-256 f44bc55b7f3a97c3…

MALICIOUS

PDF

94.1 KB Created: 2021-02-28 11:58:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 3fe344ed65f6a3d0acc505203b61c683 SHA-1: 98ab4a4ededf1e3dc0ec8938f40275801673329e SHA-256: f44bc55b7f3a97c36c21813468cc48cb84802a6d32d20529003713de43cdad39
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying it as a link farm. The document body, though heavily obfuscated, contains text related to 'Crossfit programming app', suggesting a lure. The presence of external links and the link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://lozipotod.ru/award?keyword=crossfit+programming+app PDF link annotation
    • http://kirakexig.mypressonline.com/dilezazizazowufo.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/walalobomi-nufanowipavip-fitonog-zitoxexizewikos.pdfIn PDF document text
    • https://cdn.sqhk.co/ledodatefu/ogchhVd/walmart_money_center_express_machine_near_me.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/how_to_check_tecumseh_ignition_coil.pdfIn PDF document text
    • http://zakomuxoza.getenjoyment.net/zevepetavikegupak.pdfIn PDF document text
    • http://bewewafip.scienceontheweb.net/how_much_do_ib_examiners_earn.pdfIn PDF document text
    • https://xuxukogizi.weebly.com/uploads/1/3/5/3/135320654/tiwivis.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://donijexufenu.onlinewebshop.net/vubifulafomogubezine.pdfIn PDF document text
    • https://s3.amazonaws.com/kiwopusafize/14898278098.pdfIn PDF document text
    • http://voferumupisefag.rf.gd/nurse_uniform_store_san_diego.pdfIn PDF document text
    • https://s3.amazonaws.com/gotenukevepunin/harcourt_spelling_practice_book_grade_5_answer_key.pdfIn PDF document text
    • https://s3.amazonaws.com/ragejufa/best_android_rpg_online_games.pdfIn PDF document text
    • https://s3.amazonaws.com/muvemasoxaji/iicsa_report_nottingham.pdfIn PDF document text
    • https://s3.amazonaws.com/sinamozagemoger/18790615051.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/woxal.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/bamojelibimefizitevikemit.pdfIn PDF document text
    • https://s3.amazonaws.com/wukara/biwuvuxa.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_off00013649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13649 5096 bytes
SHA-256: 5aa6d9e0038690d331c6c9c6184bf4bc7e3c28f3146a69c49887bf24ffd33b3d
font_01_sfnt_off00014788.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14788 10476 bytes
SHA-256: aeb9cc13867fc9643c104e7f9eba758521f0d3858c6dd1634f3feb2398b5c1e3

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