Malicious PDF — malware analysis report

Static analysis result for SHA-256 11d5a33c0ae2de07…

MALICIOUS

PDF

66.4 KB Created: 2021-01-25 06:29:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 30c394b350f7dbb5b0b3d1892087927b SHA-1: cf98cc53eab234a7d33e759960054ad1edbf1d4c SHA-256: 11d5a33c0ae2de07a1881a92706d19677d02a27374c4b6f31532d63f883011ca
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further solidifies this assessment. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with malicious PDFs designed to redirect users to harmful 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://traffine.ru/123?utm_term=moose+lodges+in+michigan PDF link annotation
    • https://cdn.sqhk.co/xuvetuzaxi/Va2gfOw/petifofav.pdfIn PDF document text
    • https://cdn.sqhk.co/sozasusu/Uhigihe/harvest_meaning_children_s_dictionary.pdfIn PDF document text
    • https://cdn.sqhk.co/rofejusoturi/hfifBjc/tikuvemuxexapevuzezemali.pdfIn PDF document text
    • http://yblda.fun/wd_my_cloud_wdbctl0040hwtekx5a.pdfIn PDF document text
    • http://stalekost.site/battleship_star_wars_legor7jmk.pdfIn PDF document text
    • https://cdn.sqhk.co/mikevoponage/uhehcjd/cake_decorating_kit_buy_nz.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/ha2ROit/xididonawus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412899/normal_5fd262b50d7bb.pdfIn PDF document text
    • http://robolab.one/42977161253v4mn6.pdfIn PDF document text
    • https://pinobuni.weebly.com/uploads/1/3/0/9/130969003/loxekijav.pdfIn PDF document text
    • https://cdn.sqhk.co/nivurerazusa/4Aijiif/sunimanadijem.pdfIn PDF document text
    • https://cdn.sqhk.co/lebogomatoze/gcsUiap/karopigubavopitikulasepol.pdfIn PDF document text
    • http://copyright-help-center.com/pukaserenufofezewuxi8dvap.pdfIn PDF document text
    • http://nubolutlion.xyz/941532454110q2jg.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448719/normal_5ff8fff2b1d4f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 4

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_off0000c675.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC675 5264 bytes
SHA-256: 0348b0a7fd64001f9955f80f1ee1d414b8069e710b8816a6862d48fd15f61eed
font_01_sfnt_off0000d83e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD83E 11096 bytes
SHA-256: 50d2cb6b52abb9d187ed09814dd1f9c3d31a53c5112f7e8423c5d47eb0b07b39

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