Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c93fbb04140a7b…

MALICIOUS

PDF

95.8 KB Created: 2021-02-25 18:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: d799baa420bf380d8f6a1982306a4a11 SHA-1: bf898751c94a319186015af596fb2693df9f7c49 SHA-256: 81c93fbb04140a7b8dcede6780eec47328414d6beacf9ee9dfd966a0f0ea407a
126 Risk Score

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, many pointing to disposable domains, suggesting a link farm or redirection scheme to deliver malicious content. The document body, though heavily obfuscated, appears to be a lure related to technical documentation, likely intended to trick users into clicking the embedded links.

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 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://jottigo.ru/award?keyword=oracle+apex+web+services+api+developer%2527s+guide PDF link annotation
    • http://priz24.site/403897499912j9iy.pdfIn PDF document text
    • http://fotubobuwenapu.scienceontheweb.net/yiruma_river_flows_in_you_ukulele_chords.pdfIn PDF document text
    • http://sawemawe.mywebcommunity.org/5865523659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387806/normal_6037403a2fc77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426071/normal_602aad6c6c057.pdfIn PDF document text
    • http://komaxinatobofe.medianewsonline.com/75207931384.pdfIn PDF document text
    • https://cdn.sqhk.co/denalivek/jgqgcgh/toy_box_the_sailor_song_lyrics.pdfIn PDF document text
    • http://zodatowafe.getenjoyment.net/kubota_engine_parts_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411489/normal_60253415554e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472188/normal_602aed966eb7a.pdfIn PDF document text
    • http://lixorajepidil.mygamesonline.org/stack_on_handgun_safe_dead_battery.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/2454893135.pdfIn PDF document text
    • https://cdn.sqhk.co/wukatigubo/Hieojjf/craigslist_mansfield_ohio_furniture_for_sale_by_owner.pdfIn PDF document text
    • https://cdn.sqhk.co/malofavu/qQjehdv/zaxiseg.pdfIn PDF document text
    • http://arenda-comp.space/razor_e200s_weight_limit1x1vr.pdfIn PDF document text
    • http://organicsss.space/makidewobawumartn38m.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zikoliduxa.atwebpages.com/15713092857.pdfIn PDF document text
    • http://zepizevut.atwebpages.com/cual_es_la_mejor_biblia_catolica.pdfIn PDF document text
    • http://zilowovuv.atwebpages.com/diccionario_ingles_espanol_tecnico_online.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_off00012f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F05 5660 bytes
SHA-256: d4ede537ec8daed601c02a79fc36f6fa249bd58de607d6a2cc4438c0be6f78dc
font_01_sfnt_off00014271.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14271 14176 bytes
SHA-256: 68b43acd8c7c927d7dfe02bd9c8cce233ba78bdc804cce6c7ba198b41d6ba17e

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