Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d8ca8aacd9ec999…

MALICIOUS

PDF

78.4 KB Created: 2020-12-23 21:16:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 9a0929f1390626f35d950932a0e2ee14 SHA-1: 3f69fc666e7b2605d3b0df7d9fd6776b384ddaab SHA-256: 5d8ca8aacd9ec999336ba88aa9fba2bf1d9fccdf892dd78b163e953c4e1949b1
244 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to disposable hosting services and redirectors, indicating a link farm or phishing attempt. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL leading to known malicious infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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.
  • 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://traffine.ru/strik?utm_term=coloured+rolling+papers In PDF document text
    • https://nudametuwino.weebly.com/uploads/1/3/3/9/133997501/xixajuk_gabirujivagireb.pdfIn PDF document text
    • https://rojusonevupa.weebly.com/uploads/1/3/0/8/130814232/476089.pdfIn PDF document text
    • https://kajovagej.weebly.com/uploads/1/3/4/7/134747054/lifevositamodilanala.pdfIn PDF document text
    • https://fomodaduvi.weebly.com/uploads/1/3/4/7/134700625/1818286.pdfIn PDF document text
    • https://dezazobe.weebly.com/uploads/1/3/4/7/134755526/8404669.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375199/normal_5f899354296c5.pdfIn PDF document text
    • https://tetabiga.weebly.com/uploads/1/3/4/0/134097499/1567525.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409813/normal_5f96ef04d8084.pdfIn PDF document text
    • https://rezolokad.weebly.com/uploads/1/3/4/7/134718373/6972990.pdfIn PDF document text
    • https://wamibujobaju.weebly.com/uploads/1/3/4/7/134716207/wotaxadevotuvuzin.pdfIn PDF document text
    • https://pigamudabuv.weebly.com/uploads/1/3/4/2/134235231/nanibajurim_nemumonopi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tejuvonixag/60454446569.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2ecddad-f8f5-4f34-8e95-583374974bc1/pobre_ana_chapter_7_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38ca1608-ff44-41cf-8d84-c0ae6ac21420/salekepopubilufuguxurete.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_off0000f5d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D4 5032 bytes
SHA-256: c686363bfa3636a30a6226a628fa610ed9f4e4381c1e0e04ef0950d19efcb378
font_01_sfnt_off000106fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106FC 10716 bytes
SHA-256: f919b3d36c57f8d25daa1b65df045f43d4a2b5ebb8e32931139c01ddb501b6b2

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