Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc36f09896bf0cb7…

MALICIOUS

PDF

75.5 KB Created: 2021-01-17 22:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3495d9fb9f7a4262228230d3b64de84f SHA-1: eafc2020a0ee104b3a0f40010c4b8b59ecf2d6eb SHA-256: dc36f09896bf0cb7cb42c0c5a528aac10d4b671f4c7323443b23183b6192daeb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable or suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to sites hosting malware or phishing content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to exploit users.

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://trafffe.ru/123?utm_term=iss+on+ca+drivers+license PDF link annotation
    • https://cdn.sqhk.co/rifusofuwedi/3gYs0qU/multi_parallel_64_bit_apk.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/vovadigofovexuneze.pdfIn PDF document text
    • http://guvinesusavilo.iblogger.org/giwokibubunodo.pdfIn PDF document text
    • https://site-1244479.mozfiles.com/files/1244479/certificate_of_appreciation_template_editable_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wezufunin/zhigghh/trap_adventure_1_mod_apk.pdfIn PDF document text
    • https://site-1167931.mozfiles.com/files/1167931/30637236798.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416802/normal_5f9cae9a3aace.pdfIn PDF document text
    • https://direnebem.weebly.com/uploads/1/3/4/6/134641367/datowiduboz.pdfIn PDF document text
    • https://site-1167973.mozfiles.com/files/1167973/kiliseseduwewovu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_5ffabe32b5a2d.pdfIn PDF document text
    • https://cdn.sqhk.co/takularozo/2Eiapgd/taxumana.pdfIn PDF document text
    • http://tonorubur.22web.org/ascension_mont_blanc_prix_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/boketumejipa/c4ogijh/bakipozobatepiboliweti.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486359/normal_5ffcb09895659.pdfIn PDF document text
    • http://gadezobokonej.iblogger.org/better_business_bureau_canada_complaint_form.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
    • http://lojupefiduk.epizy.com/barbie_makeup_salon_game.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/vaderewe.pdfIn PDF document text
    • http://likasiz.epizy.com/decimal_computation_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/46410906323.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 4640 bytes
SHA-256: 5a5171eb6276d564056b79ef9a85715ded1918e02ac3e9fd5a442f30b70169c5
font_01_sfnt_off0000ee0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE0F 10712 bytes
SHA-256: 936633342671a28b38db87a71a4d365975e42a4e0802494ef96509611d798e0d
font_02_sfnt_off000112b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112B3 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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