Malicious PDF — malware analysis report

Static analysis result for SHA-256 a289722b5a098842…

MALICIOUS

PDF

71.1 KB Created: 2020-12-31 12:22:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d27656c169e88c9f56d92fc3f642c89f SHA-1: 289f19047ff8a7acc3efaf86bcfdb8f7a4e831a9 SHA-256: a289722b5a098842e6a5d17c5705f16224f94da858920de208a491836bab56df
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. The presence of external URIs and the overall structure point towards an attempt to exploit user interaction via these links.

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
  • 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.
  • 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://traffking.ru/strik?utm_term=top+free+dating+website+apps PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368468/normal_5f8824bf0679f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_5f91c97a3ff07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367643/normal_5fbe1410dabbc.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/6aea64bc04a.pdfIn PDF document text
    • https://gejatovuri.weebly.com/uploads/1/3/1/4/131406669/7af12562e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367000/normal_5fe2f9a76d5e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411714/normal_5fe24579d7e32.pdfIn PDF document text
    • https://gimejexoxixaza.weebly.com/uploads/1/3/1/8/131872185/wotareropajewub.pdfIn PDF document text
    • https://fekarerexenafot.weebly.com/uploads/1/3/4/6/134698220/5147691.pdfIn PDF document text
    • https://nometiru.weebly.com/uploads/1/3/4/3/134379396/rajabaros-pulobazox-lutoto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fbf5c60772be.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/4ab1278e-5d7f-4e83-bcbb-4aa4f086ed04/49177139419.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_off0000d9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F2 5356 bytes
SHA-256: 94ca4d6a1b3d529e5aa3a2ab01e27c0f8ee7a4ddf63939740c6069c513b85782
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 10460 bytes
SHA-256: 8b237758da44394895bec61d8762cc1e9c4dbf89f1022cdb437d557e814a922a

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