Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba79b57808857a64…

MALICIOUS

PDF

80.2 KB Created: 2021-03-05 10:48:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 90d720de569b2ced20af5ca92de88f84 SHA-1: e0a1ebc414aa33d9e255c6e577ddadbf8b6679d3 SHA-256: ba79b57808857a64a698ee72bb673c6bf547469c073192bca359a1ae01e9a610
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are dynamically generated, suggesting a link farm or SEO abuse tactic. The primary external URI points to 'fokemale.ru', which is suspicious. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, contains text related to resetting a bike computer, which is likely a lure to encourage users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=how+to+reset+bontrager+trip+300+bike+computer PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4382631/normal_6039040cd2ed8.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/RjtibCi/faxeliwudek.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/jijil6r/moto_traffic_rider_bike_racing_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/ha3ujbA/94281320690.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/87X5hbv/newimewarelesox.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/popuba_rewojuxumed_kojijorejo.pdfIn PDF document text
    • https://cdn.sqhk.co/zijikunu/ar1Chd1/talking_tom_and_friends_movie_star_angelo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449600/normal_5fe103994d617.pdfIn PDF document text
    • https://pefodiral.weebly.com/uploads/1/3/4/4/134476409/zesukibopitaguj.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://s3.amazonaws.com/patilawasu/jegagelafosadivafaladalar.pdfIn PDF document text
    • https://s3.amazonaws.com/nowonovege/bubble_trouble_miniclip_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/college_admission_process.pdfIn PDF document text
    • https://7f1d4f38-7308-4051-b389-b8ed31312188.filesusr.com/ugd/e948c1_61b2feeb62454d1f99cca130f7af73f9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mukutud/grammarway_3_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/yamaha_g1_electric_golf_cart_parts_diagram.pdfIn PDF document text
    • https://ecf8b3bd-8201-449f-a39c-156acd88681e.filesusr.com/ugd/97634b_b62fe34cf0ac43ad8b6a955afa4f49d4.pdf?index=trueIn PDF document text
    • https://436c154b-1c2d-4c60-9768-ed3a268ef5e1.filesusr.com/ugd/e8e253_49ce564606204392ae572fa10bc51898.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_33c23c338b164aec9696e93353d4ac3c.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000edc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDC3 5664 bytes
SHA-256: 0c69d71f0b969b6cf4c332061421612ed7940750d37dedf8935578a0f31af7b7
font_01_sfnt_off00010107.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10107 10588 bytes
SHA-256: 8bb067d9c70be806197f0e4bd9bb06ef9a07ecbf369e38151cfa7616c5ddd149
font_02_sfnt_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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