Malicious PDF — malware analysis report

Static analysis result for SHA-256 900af2dcdb55f957…

MALICIOUS

PDF

72.8 KB Created: 2021-01-02 13:54:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ab067274fc2b8a2d86e5dcf974df0c10 SHA-1: d1b6e6b86734fac16310a0323eef730a5833e769 SHA-256: 900af2dcdb55f9572c595f5ce281a97870c6dfcb9bb618056a10f4075d26aa75
244 Risk Score

Malware Insights

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

This PDF document contains a large number of embedded links, with at least one identified as a malicious redirector. The heuristic firings indicate it's part of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly support its malicious nature.

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://traffmen.ru/aws?utm_term=500+essential+words+for+toefl+pdf In PDF document text
    • https://gidavazowas.weebly.com/uploads/1/3/4/8/134863559/575554.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445125/normal_5fcd71b93d91a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5fdfaaec9732f.pdfIn PDF document text
    • https://jofuwutiduf.weebly.com/uploads/1/3/4/7/134728528/5a2c38a.pdfIn PDF document text
    • https://poxuxeket.weebly.com/uploads/1/3/3/9/133997588/milisajavikaposama.pdfIn PDF document text
    • https://ludalobupum.weebly.com/uploads/1/3/4/5/134528654/mupodidet-kigum.pdfIn PDF document text
    • https://rejajosafijaba.weebly.com/uploads/1/3/4/5/134590771/a127cc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389106/normal_5faeba93f2ce3.pdfIn PDF document text
    • https://tozarezev.weebly.com/uploads/1/3/4/3/134374844/8928794.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375705/normal_5fb3ffabc879e.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/0886273a-32e7-418d-9d5f-e621ab6db48e/ms-7826_kaili_gtx_1060.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/38763859936.pdfIn PDF document text
    • https://s3.amazonaws.com/fejatepudopito/fisogokufidobadig.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_off0000db1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB1E 5296 bytes
SHA-256: e3e6b39d39586afa0b16e7c837d0fa7eb45c426297ebe3d6469991b2d67ba697
font_01_sfnt_off0000ed46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED46 13004 bytes
SHA-256: 01b98e83fed9fe1d2fd867b875d872dc03db41f5b8249233d2a68f2827515503

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