Malicious PDF — malware analysis report

Static analysis result for SHA-256 832436853c46f2fc…

MALICIOUS

PDF

90.3 KB Created: 2021-05-25 11:14:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: b22de4c3b5f5394ac5680e10b3535d54 SHA-1: 906ae37d85d146e6784d16e6dc609fecd087ca26 SHA-256: 832436853c46f2fc28345760cfd40d1204282fe4c0320218d95f432ebac205e6
156 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 for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. The primary malicious URL identified is https://fokemale.ru/strik?utm_term=gree+split+ac+error+code+h6, which is likely used to redirect users to a malicious site. No scripts were extracted, but the PDF structure and link farm behavior are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://fokemale.ru/strik?utm_term=gree+split+ac+error+code+h6 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4384464/normal_5ff2228e041bb.pdfIn PDF document text
    • https://jolidanovuson.weebly.com/uploads/1/3/4/8/134868646/kifujitukidepifono.pdfIn PDF document text
    • https://jerexibim.weebly.com/uploads/1/3/4/6/134654770/156c29c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_6050b4fbe753d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_60503e6ac1f7e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406241/normal_5ffadeb7259ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388612/normal_5fc8b5703b0ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4530712/normal_5fc6db4ad2514.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0a6e704-4d6e-4e96-90c1-779ec5039fac/what_is_superfight_card_game.pdfIn PDF document text
    • https://s3.amazonaws.com/fakuguvil/59831339979.pdfIn PDF document text
    • https://s3.amazonaws.com/kuboki/runtuhnya_dinasti_abbasiyah.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/90219883801.pdfIn PDF document text
    • https://s3.amazonaws.com/jolunenafobuw/35480710888.pdfIn PDF document text
    • https://s3.amazonaws.com/jizubisetebof/nodakebosagatawenez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7cc0009b-bb04-47de-9d4f-c416980380f6/sink_drain_parts_diagram.pdfIn PDF document text
    • https://s3.amazonaws.com/gupawupigawono/physical_science_grade_11_september_2018.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/703bfe11-5614-474c-9b13-cc2b67fba753/can_you_get_a_covid_antibody_test_at_kaiser.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0132e0f2-762c-469a-ae99-8182b38a8e92/lou_gehrig_farewell_to_baseball_speech_analysis.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_off00012553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12553 5344 bytes
SHA-256: 8327db36f93a88eb662dbb940fd690e4b7f782094a8877ec2734ae3c72b1dc42
font_01_sfnt_off00013777.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13777 10672 bytes
SHA-256: 2a03c3bd3063152b8ad04ae642abf3e6e816c5f3a9829e1f771886329c162527

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