Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a894893e1fe6a11…

MALICIOUS

PDF

67.3 KB Created: 2020-12-27 00:40:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 03edece5fc118c06a126f7e6735fbcea SHA-1: b1eb1107b8d5d18624b5be99e1925a67723dea08 SHA-256: 2a894893e1fe6a117ffbcfa14b807affbd50154c369d347e9da28869645a01b0
244 Risk Score

Malware Insights

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

The PDF contains a large number of links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. One critical heuristic indicates that a link points to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text related to job searching, suggesting a lure to trick users into clicking these malicious links. The presence of numerous PDF links and a redirector URL strongly suggests an attempt to lead users to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/strik?utm_term=assistant+general+manager+jobs+near+me In PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/51201.pdfIn PDF document text
    • https://kusudojisopev.weebly.com/uploads/1/3/4/7/134774064/wixeburegaw.pdfIn PDF document text
    • https://duvonejubuzal.weebly.com/uploads/1/3/4/3/134321315/5546457.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370533/normal_5f882fba7de29.pdfIn PDF document text
    • https://rosanibo.weebly.com/uploads/1/3/4/8/134873488/gibadaginuxa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412899/normal_5fddf690caca8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fd65607ea695.pdfIn PDF document text
    • https://sokazavuse.weebly.com/uploads/1/3/1/3/131378988/2965224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387233/normal_5fb2a5aeede98.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/liwafo/341907279.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_off0000cbea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBEA 5212 bytes
SHA-256: 98d66f6cf6b23d5e54f94803c2d68b06192f5f198cb06adbe48af2e26b6fa2a9
font_01_sfnt_off0000dd8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8F 10356 bytes
SHA-256: a1d9bf0bcfec1599046bf2b14aedfd92a9a734b3079e78abad764d73e1c12b1f

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