Malicious PDF — malware analysis report

Static analysis result for SHA-256 a627b4bdf2b38c1f…

MALICIOUS

PDF

69.3 KB Created: 2021-02-15 09:08:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: ceb1d846052d485d1d48dbf6234a35db SHA-1: db658ebf6fc37240d318583fe278837605e9a776 SHA-256: a627b4bdf2b38c1ff069ab1b8d5c56a6ab9eb4307a7008cdfc696436c5581ec6
146 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many hosted on disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to be a lure related to game cheats, aiming to trick users into clicking malicious links. The presence of multiple external URIs and link farm characteristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://druttle.ru/123?utm_term=pokemon+ruby+walkthrough+walls+cheats PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4469355/normal_6024571eb99a9.pdfIn PDF document text
    • http://svoytrylend.xyz/53408557953davjb.pdfIn PDF document text
    • http://itrom.fun/ilona_andrews_magic_triumphs_epuba8m3s.pdfIn PDF document text
    • https://cdn.sqhk.co/vovigewuva/24UjfRP/neribigilosapuka.pdfIn PDF document text
    • https://cdn.sqhk.co/sadirorig/ggfgc2T/49794175279.pdfIn PDF document text
    • http://alex-chekalev.com/cbt_assertiveness_trainingohwma.pdfIn PDF document text
    • https://jivexine.weebly.com/uploads/1/3/1/3/131380908/5329976.pdfIn PDF document text
    • http://umniashka.ru/sunday_school_songs_whisper_a_prayerq4h03.pdfIn PDF document text
    • https://ramimuluvisefo.weebly.com/uploads/1/3/0/7/130775145/bigetudi-sudolewesabide-lelawi-pidosofeveke.pdfIn PDF document text
    • http://qunit.space/a_pilgrimage_to_tawang_summary7i3eq.pdfIn PDF document text
    • https://zetodimamewiwek.weebly.com/uploads/1/3/2/3/132302859/nifuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/paxunu/finusukoferazazuxetofo.pdfIn PDF document text
    • https://s3.amazonaws.com/zafaronivaj/55551995007.pdfIn PDF document text
    • https://s3.amazonaws.com/sobaketemu/zekili.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/iv_administration_guidelines_for_nurses.pdfIn PDF document text
    • https://s3.amazonaws.com/vonuxagupeduze/26442703313.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_off0000d056.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD056 5612 bytes
SHA-256: 8e03278323c40e3b3d4b15e4d200d9f31f990bc980599a764d2e89ebe1b27a04
font_01_sfnt_off0000e362.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE362 10776 bytes
SHA-256: 2966ab9119f47fad57583f1d3e05dc2b5a451c7e152cfffbc7089ed86c5cf7df

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