Malicious PDF — malware analysis report

Static analysis result for SHA-256 af3433c9f876668e…

MALICIOUS

PDF

68.4 KB Created: 2020-12-11 01:53:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e73af8ddd9bf40961cbdc8eaae351c11 SHA-1: d2011d2fb3200c2fdd74d354a9197ba2cbe9422a SHA-256: af3433c9f876668e1c600615bf1e95a01ccb9b3a5699197d73de9f5d1ead7fbe
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are to SEO-optimized PDF documents, suggesting a link farm or content-spinning operation. One prominent URL, 'https://trafftec.ru/strik?utm_term=san+diego+craigslist+jobs+gigs', appears to be a lure for job seekers. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://trafftec.ru/strik?utm_term=san+diego+craigslist+jobs+gigs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404969/normal_5fa225e2eb996.pdfIn PDF document text
    • https://gogesatita.weebly.com/uploads/1/3/4/3/134321397/sofepituwufagotuno.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370092/normal_5f9dc780c8afd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448343/normal_5fa12fb54a6e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410030/normal_5fadabe31f7d1.pdfIn PDF document text
    • https://topemarepebide.weebly.com/uploads/1/3/4/3/134316461/tidugapiduj-simuge.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0ef8fc6229360ecad283f/t/5fc68762f8cdb769c6c6a32e/1606846307326/can_you_charge_apple_pencil_without_adapter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/274e104f-2972-4cb6-9748-2276880a9770/77617530556.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3a6ce03-5677-492f-8f39-66c62c26fa19/pescadero_california_koa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3460cbe-46f1-46d7-9a18-df434dffda71/63978137237.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2edc075-9850-4c59-b67a-7eef025af90c/fajewikenukoruk.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/system_requirements_lab_detection_app.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_off0000cd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD2E 5424 bytes
SHA-256: b8e12c5f756e89c5c738c0d0924d97b4f9e4f35ca3e6952f6a77a7ef60ca8015
font_01_sfnt_off0000dfaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFAF 11036 bytes
SHA-256: a781e7784903d3a4dbb1af1f00fbcdf90374745ccdd245d5e0a592783292b6e3

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