Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0534f1b38e3c6b6…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 23:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 4f5a38709a90026a64bde739943ec522 SHA-1: b176c81b40075a0eeda4d4bb0050377e821ca26c SHA-256: c0534f1b38e3c6b65a78368b55b96aee84a7ae394167aa9531cf046cfb81632c
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 domains, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing attachment.

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://resalured.ru/strik?utm_term=simple+past+tense+exercises+englisch+hilfen PDF link annotation
    • https://cdn.sqhk.co/sexasegavon/5Y81pje/transitive_and_intransitive_phrasal_verbs_worksheet.pdfIn PDF document text
    • https://cdn.sqhk.co/rizakumer/hbdifjc/ticket_to_ride_online_unblocked.pdfIn PDF document text
    • http://theporte.xyz/xexafobagenukakumegakos96fr.pdfIn PDF document text
    • https://dajukufatob.weebly.com/uploads/1/3/4/3/134345308/3465475.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_6051ebb7238a5.pdfIn PDF document text
    • https://semukozev.weebly.com/uploads/1/3/4/4/134493414/2823fbe.pdfIn PDF document text
    • https://cdn.sqhk.co/niramojiga/bRihjjb/royal_chess_game_free_download.pdfIn PDF document text
    • https://musevupuli.weebly.com/uploads/1/3/1/4/131438528/7450909.pdfIn PDF document text
    • http://medicalpracticementor.com/best_metal_detector_apk0hw37.pdfIn PDF document text
    • https://cdn.sqhk.co/ridijafugemi/gQy64Ru/99998009450.pdfIn PDF document text
    • https://ladetizor.weebly.com/uploads/1/3/4/7/134731735/5772053.pdfIn PDF document text
    • https://zumaboletafu.weebly.com/uploads/1/3/1/4/131454272/xudilabov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366311/normal_5ff6567fa6f6a.pdfIn PDF document text
    • https://zevexeduj.weebly.com/uploads/1/3/0/8/130874566/mitese.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/18709899647.pdfIn PDF document text
    • http://bepolujogox.atwebpages.com/silopijulugekul.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_off0000e999.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE999 5600 bytes
SHA-256: 6a52d97a1b0a8f3346466e574fe14f0543dfddad01e02f5a0d71ce2e765a3dbf
font_01_sfnt_off0000fc79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC79 11852 bytes
SHA-256: 97d6c137b2536a391a8d7297e5fe3d4a7c91d1ce2a85e5785c08a4adf623a05f

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