Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fe7659016ec6bc1…

MALICIOUS

PDF

68.7 KB Created: 2021-04-05 03:33:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 7dd4ada13616ead0b51cbc094fc1d234 SHA-1: 4b8f1074ca74e6d187c9c90ab1904b2cfb69ac10 SHA-256: 1fe7659016ec6bc14748d353d876fe30b5a826d6fcbf422367a008e378e98950
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains references to an 'appliance module' and 'wkhtmltopdf', likely serving as a lure to direct users to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://zajinet.ru/strik?utm_term=x10+powerhouse+appliance+module PDF link annotation
    • http://getcreditreport.info/sovizeligedbzbn8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_5fea274597459.pdfIn PDF document text
    • http://sollabs.xyz/407051226570mizi.pdfIn PDF document text
    • http://wssummer.space/netbeans_for_mac_high_sierrayqrwm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_603506781e01d.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/dLY8wJv/stickman_shooting_games_unblocked.pdfIn PDF document text
    • http://marketop.club/nujozikuvugidiw8gpz8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391013/normal_605059e1dc74d.pdfIn PDF document text
    • http://maddot.space/how_to_open_system_preferences_on_macbook_provtlsq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445879/normal_5fe3bbd540350.pdfIn PDF document text
    • https://cdn.sqhk.co/vopuvafamiw/Loghih9/34172841502.pdfIn PDF document text
    • http://ita-bio.space/zikonir7d39.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375889/normal_5ff463faba401.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375197/normal_601da84621972.pdfIn PDF document text
    • http://cocobeautybar.ca/xobekewqzzp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457296/normal_601074de4b452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417980/normal_6035c38ff0547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405185/normal_606a54abc50db.pdfIn PDF document text
    • http://imedo.ru/lakukemekijixafisitowdz4sz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388619/normal_5fe0de7877e0b.pdfIn PDF document text
    • https://cdn.sqhk.co/wotutovebo/jc30IvS/daramila.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376374/normal_6052b9a9ecbec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369900/normal_6015b1699ebff.pdfIn PDF document text
    • https://cdn.sqhk.co/pojuwudedi/eSgihTM/73613155187.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000cdc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDC7 5576 bytes
SHA-256: 1326a225fa723709a78036887efa1ee09b7760d64829e47fd057d5ce79fa232f
font_01_sfnt_off0000e0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A3 10708 bytes
SHA-256: b0a1e982b68b48a316edbc7f012ac632c69f05e2b70a1d14f9a3b6773a6e1586

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