Malicious PDF — malware analysis report

Static analysis result for SHA-256 8091e1b6d9819a23…

MALICIOUS

PDF

66.1 KB Created: 2020-12-01 18:09:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: a8b85751faea83e6c6bb00e5ae016eb5 SHA-1: 3022353c415a5a7e18a16260378e4b3fb5755f9b SHA-256: 8091e1b6d9819a23578387e235475acfe954970ba9da05f51e8792a625e7b780
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting services, indicating a link farm designed to distribute traffic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classifier flagging further supports its malicious nature. The document's content, disguised as a safety data sheet, is a common lure for phishing or malware delivery.

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://trafffi.ru/aws?utm_term=lithium+ion+battery+material+safety+data+sheet PDF link annotation
    • https://loraxero.weebly.com/uploads/1/3/4/3/134332649/datavasu-devituz.pdfIn PDF document text
    • https://mesenogixu.weebly.com/uploads/1/3/4/7/134736765/52405.pdfIn PDF document text
    • https://ruritetij.weebly.com/uploads/1/3/4/7/134704214/2908196.pdfIn PDF document text
    • https://tujezaxe.weebly.com/uploads/1/3/4/6/134616668/9525170.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365620/normal_5fbd8dc416fae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_5fad3fc123202.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486565/normal_5fc34c0fc7880.pdfIn PDF document text
    • https://juladuwupib.weebly.com/uploads/1/3/4/7/134763366/vazakefalegu.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/watajive/26281827656.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5529f573-91bd-40f0-bde5-05c795959879/66499598112.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/aadhar_card_by_aadhaar_number_only.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86185fd5-e712-453b-bde4-cc8e5f9e10c8/rompecabezas_de_las_partes_del_cuerp.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC899 5332 bytes
SHA-256: b3030a1853c174ef7b2f3172872be964849a4753e063ba9ab8326e923a301b32
font_01_sfnt_off0000da95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA95 9784 bytes
SHA-256: 50c6de20c8d981e6205dc50c9bcfbe6a9348621fbcc8b7cc8b24ad6271cd4297

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