Malicious PDF — malware analysis report

Static analysis result for SHA-256 a644df8ab2766495…

MALICIOUS

PDF

74.2 KB Created: 2020-11-22 06:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 00f95dc321811a0734bb8e3f6fb41efd SHA-1: 1b0128ea53f0c6c7cf43ef42ba85a92be9904f92 SHA-256: a644df8ab27664951bb6840ce2f40077273103a240124c1b8be94ce8938fa442
214 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous external links, including one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to malicious sites, likely for phishing or further payload delivery.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=the+land+of+the+midnight+sun+alaska In PDF document text
    • https://fixivure.weebly.com/uploads/1/3/4/8/134888316/tuwotidub_doxoxam_fesisuxin_binovidimabux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_5f970c8e3d93a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368972/normal_5f9d80c036ffd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371005/normal_5f883b584ec19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fb7779928567.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
    • https://uploads.strikinglycdn.com/files/bb84abd4-88ea-46d6-8780-114aef34d017/tinatomoxojofa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d975ead1-7116-44b4-8575-553129f02777/xozadaveno.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/174e4832-4822-4fd6-8828-593d9efb938b/takososidoxigilidaloxix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/72620dc4-0ad8-46e9-9e66-1331768b1a33/slime_rancher_vacpack.pdfIn PDF document text
    • https://s3.amazonaws.com/fizufapu/vezagomepaxizikafaridula.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37adc0c4-b5b4-4db1-a953-5ffc3211e2c4/kokepalapakodo.pdfIn PDF document text
    • https://s3.amazonaws.com/baritexovopa/shopsmith_mark_7_used_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/99724601954.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f4d5181-70c8-4a5f-af7f-4d17f4ce12ec/ap_seminar_oral_defense_questions.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_off0000d71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD71D 5120 bytes
SHA-256: db75a334805b1a21269a25955ad726e5da028b609d0be33e38efe8f0eb95de6b
font_01_sfnt_off0000e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE867 11048 bytes
SHA-256: bac6b07863254ee18b59408a1c20727b0f2ba0bb4f37dab37479a3f2be837611
font_02_sfnt_off00010dd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD8 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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