Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f4ee618d29aa96b…

MALICIOUS

PDF

73.4 KB Created: 2021-02-23 18:50:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 83085cdd169700ba6dcfbe99e53d6e5f SHA-1: f0ec6a9a11a2de563c50dd06457f645bc124f212 SHA-256: 4f4ee618d29aa96beccb120f03b0e715da88b50f837d104adb7e8979c72a6e0b
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or hosting further malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/123?utm_term=1997+yamaha+timberwolf+250+4x4+specs PDF link annotation
    • http://mujepojubum.22web.org/33477793168.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/ifzCheo/61006988212.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/rafokopaw.pdfIn PDF document text
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/garapawinipuzegi.pdfIn PDF document text
    • https://cdn.sqhk.co/pevejotomoma/qjdqLji/nesud.pdfIn PDF document text
    • http://tujozavido.66ghz.com/b_e_o_full_form_in_kannada.pdfIn PDF document text
    • https://puwevifu.weebly.com/uploads/1/3/4/4/134465284/e0948a55d2c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381962/normal_5ffa877da9492.pdfIn PDF document text
    • https://cdn.sqhk.co/dokiladigana/76hbvbe/easy_voice_recorder_for_pc.pdfIn PDF document text
    • https://cdn.sqhk.co/bekutojeke/yaibyWt/crossing_over_occurs_during_which_phase_of_mitosis.pdfIn PDF document text
    • https://cdn.sqhk.co/mujejadalale/Pggdiif/15088294677.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wusepobokajed.rf.gd/87065774837.pdfIn PDF document text
    • http://pobuwejugu.epizy.com/xukawukexitudotivirimide.pdfIn PDF document text
    • http://nadadeze.epizy.com/4_pics_one_word_level_2659.pdfIn PDF document text
    • http://tipuvebujanapig.rf.gd/family_friendly_workplace_policies_in_germany.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_off0000dc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC0D 6336 bytes
SHA-256: e9f42e6eec3d7d517ae0bb1335841a60711b642602092b0adee61620ceecf5f1
font_01_sfnt_off0000f19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF19C 11364 bytes
SHA-256: ee9f92b95a7ee1da2ace8306c835a742e00447d6b8c65fbfdadbc67e22777a6c

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