Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6b654a7423030e…

MALICIOUS

PDF

71.1 KB Created: 2021-02-10 18:28:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2297f19917a87dfd8e6ac9dfe1a67198 SHA-1: 6b75e85b2c9df05624d1701d793624f34a894f40 SHA-256: ed6b654a7423030e35d5f1f2e467d27873d2c5f44a1e0c567f503b49a6ae00a2
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a date, but no clear textual lure. The presence of external URIs and the link farm heuristic strongly suggest the document is designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wb?keyword=general%20orders%20army%20study%20guide PDF link annotation
    • https://cdn.sqhk.co/lifudidu/igeghLI/find_my_phone_by_number_location.pdfIn PDF document text
    • https://zajodufukotu.weebly.com/uploads/1/3/1/8/131857357/7312953.pdfIn PDF document text
    • https://cdn.sqhk.co/zejegure/gcA8j9U/business_standard_newspaper_price_in_delhi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454040/normal_5ffcf9be7430c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5fde92929762d.pdfIn PDF document text
    • https://cdn.sqhk.co/jabosuve/aiaifjf/rofomuniboboduforudase.pdfIn PDF document text
    • https://gotivewa.weebly.com/uploads/1/3/1/0/131070711/3009580.pdfIn PDF document text
    • http://numidib.22web.org/90942442493.pdfIn PDF document text
    • https://bagubabijotete.weebly.com/uploads/1/3/4/3/134319258/wegedesiwe_werasidef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420014/normal_5fda870a0da75.pdfIn PDF document text
    • https://waxogisuges.weebly.com/uploads/1/3/0/7/130776632/4390029.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485322/normal_5fece9c5d2c13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475217/normal_5fe91d7836327.pdfIn PDF document text
    • http://jijimaxugixu.22web.org/lodozajin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://riperuzitino.rf.gd/leparasovosegoso.pdfIn PDF document text
    • https://s3.amazonaws.com/gifojuxaxeva/maulana_abul_kalam_azad_in_urdu.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_off0000da33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA33 5280 bytes
SHA-256: 4a526bca4471d3c8bba1eed79cb648586372845841ca597a5c2d7fab15e823e3
font_01_sfnt_off0000ec17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC17 10292 bytes
SHA-256: 3c0b070e0a9ae2bf32c9d42829e78818e3485a248a2580c03075f517960c6f1f

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