Malicious PDF — malware analysis report

Static analysis result for SHA-256 473734031e1d26e8…

MALICIOUS

PDF

77.6 KB Created: 2020-12-28 13:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: eeb168263e2d1104fc4987f410538973 SHA-1: 61fe7182d214b64ec2f01ec5fe10f7a7bf7c9411 SHA-256: 473734031e1d26e89886d476d321906d15cf9796cecaccf2caf71d2a3be9c978
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of external links, many hosted on 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 multiple external URIs and the PDF_SEO_LINK_FARM heuristic confirm the link farm behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://traffnew.ru/123?utm_term=bluetooth+obd2+adapter+iphone PDF link annotation
    • https://fekanarikivokil.weebly.com/uploads/1/3/4/8/134884633/354dcb7c68f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447450/normal_5fbb8b863e21f.pdfIn PDF document text
    • https://funefazadoma.weebly.com/uploads/1/3/4/6/134648765/9429957.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_5fbdce3dd0d56.pdfIn PDF document text
    • https://nuzixusimupe.weebly.com/uploads/1/3/4/3/134306281/jewosiju-wukogige-dojogusujana-bokeburatowelu.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/dszgjyE/68263144273.pdfIn PDF document text
    • https://wofalexo.weebly.com/uploads/1/3/4/6/134697980/8638193.pdfIn PDF document text
    • https://figapizezedop.weebly.com/uploads/1/3/4/3/134364787/4231727.pdfIn PDF document text
    • https://cdn.sqhk.co/ranotigu/fjbjdif/sodim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466679/normal_5fb622d7547c2.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/vasofirida/android_tv_box_movie_apps_2018.pdfIn PDF document text
    • https://s3.amazonaws.com/pazovugal/carrom_clash_money_apk.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_off0000f3a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A2 5192 bytes
SHA-256: 424e747c6e947e9d1306b3ddd8e053f2aa2b2467df8892e265680384eb6c7f6b
font_01_sfnt_off00010536.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10536 10728 bytes
SHA-256: e7dd226e9aeca966486fddda2c68f1a52db2c0d8be745efbb8f5c8cef5c77c65

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