Malicious PDF — malware analysis report

Static analysis result for SHA-256 050b6526642310fe…

MALICIOUS

PDF

69.6 KB Created: 2021-01-23 11:44:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 8df911e897a4a7b25018799cb103e4dc SHA-1: 672e9e3837e0460cbd151f920cf122b971ce8b8f SHA-256: 050b6526642310fe2268d0009b0c6e6c807f7932bd7b443a34c526b1fdfc6faf
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous embedded URLs, many pointing to disposable domains and employing UTM parameters, strongly suggests a phishing or link-farming operation designed to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/aws?utm_term=beretta+handgun+92x+performance PDF link annotation
    • http://tewazezila.66ghz.com/bimco_standard_bareboat_charter_form.pdfIn PDF document text
    • https://site-1245383.mozfiles.com/files/1245383/68562565623.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483602/normal_5fd6621300e8b.pdfIn PDF document text
    • http://vogeposekuxav.66ghz.com/forming_storming_norming_performing_adjourning_meaning.pdfIn PDF document text
    • https://site-1171785.mozfiles.com/files/1171785/pepudeseluxadusu.pdfIn PDF document text
    • https://cdn.sqhk.co/kobedobofepo/c0giT9o/stickman_archery_2_bow_hunter.pdfIn PDF document text
    • https://site-1178374.mozfiles.com/files/1178374/gexajipo.pdfIn PDF document text
    • https://site-1178022.mozfiles.com/files/1178022/world_war_1_brief_history.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419193/normal_5feefd9bdfe24.pdfIn PDF document text
    • https://site-1192771.mozfiles.com/files/1192771/sell_walmart_gift_card_for_bitcoin.pdfIn PDF document text
    • https://site-1166597.mozfiles.com/files/1166597/apush_chapter_6_study_guide_answers.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://saxowuwu.rf.gd/55474319745.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_off0000d26e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26E 5764 bytes
SHA-256: 838db6d31dac67117f368d4c2dec4312339a9f7255a6efa6fcc626050c3c80fa
font_01_sfnt_off0000e5f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F4 10552 bytes
SHA-256: ddc6ef610e465c33fd06aff4533be5008f20ed29b85b6d3c9201b4f8fec9e75e

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