Malicious PDF — malware analysis report

Static analysis result for SHA-256 82c241f65f3bf6e4…

MALICIOUS

PDF

79.7 KB Created: 2021-04-20 21:47:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 753bc313047a2ee8a14dba3e2089b007 SHA-1: b153c64f54313cb8684f4dce301d6281aa5353fd SHA-256: 82c241f65f3bf6e4655be5ba674cdb4bdb0dfee3c502e9995f0726728230300f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with a high heuristic score indicating it functions as a link farm hosted on disposable domains. The document body, though heavily obfuscated, suggests a lure related to 'what to use instead of stylus', likely a pretext to drive traffic to malicious sites.

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/strik?utm_term=what+to+use+instead+of+stylus PDF link annotation
    • http://fiziwafofekaku.mygamesonline.org/kovevejidijagikavol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425759/normal_606e1bb1c78eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_606e3797ca02e.pdfIn PDF document text
    • https://cdn.sqhk.co/nugofonavuf/RGghdkj/super_fast_rc_drift_cars.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403413/normal_5ffc733850891.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471250/normal_603257719c6bc.pdfIn PDF document text
    • http://trycabinets.xyz/1316715271766fqt.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453579/normal_5ff9b71188782.pdfIn PDF document text
    • http://nageramuvepom.mywebcommunity.org/anlaute_ben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456143/normal_601f304bab58a.pdfIn PDF document text
    • http://thepropheticapp.com/nifibewujajubali599mj.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/90684690412.pdfIn PDF document text
    • https://cdn.sqhk.co/savunowudob/ag6F4hb/60465236127.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378155/normal_5ff1355b212dd.pdfIn PDF document text
    • http://dalosizofovabes.medianewsonline.com/how_to_install_operating_system_on_hp_pavilion.pdfIn PDF document text
    • https://cdn.sqhk.co/rajemaramiw/eJjciap/movie_matinee_images.pdfIn PDF document text
    • http://aov.one/what_form_of_government_did_ancient_greece_and_ancient_mesopotamia_have_in_common3tgnm.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388596/normal_5ff326b7e0668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478961/normal_602d06e436064.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/47e079ae-7955-47b0-84f2-7ead3b87c789/how_to_turn_off_demo_mode_on_sony_handycam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ceefdb7-4292-4181-a2aa-befa8cef6fd4/servo_i_vent_modes.pdfIn PDF document text
    • http://dapekafuxururo.myartsonline.com/ncert_english_beehive_class_9_download.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED18 4896 bytes
SHA-256: cc7816e36d713093c76e7c21aa0e944d9f3c83a1aef8f542dc5cc5834898e40c
font_01_sfnt_off0000fdce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCE 11004 bytes
SHA-256: e2446d0b928e94347a2112b7db91260078b285e6f4e3b2e100a361ababa8c6c8
font_02_sfnt_off00012358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12358 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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