Malicious PDF — malware analysis report

Static analysis result for SHA-256 668bc372e1dace2a…

MALICIOUS

PDF

96.3 KB Created: 2021-01-10 00:32:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 323f61e6a166d7f56dd22a5687d4c6db SHA-1: 7eabcec673f086a4379cac18da1d6f3528701559 SHA-256: 668bc372e1dace2a86fe56ecf9ec1779b67b49648fc6cfbc8783e64c2566f66e
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was flagged as malicious by multiple heuristics and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of embedded links, many of which point to disposable hosting services and known redirector infrastructure, suggesting a phishing or scam campaign. The primary goal appears to be directing users to external, potentially harmful websites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/123?utm_term=the+basic+eight+free+pdf In PDF document text
    • https://dojifidixiwaji.weebly.com/uploads/1/3/4/3/134372722/4679802.pdfIn PDF document text
    • https://xoxomupufolud.weebly.com/uploads/1/3/0/9/130969418/7901186.pdfIn PDF document text
    • https://sosegasum.weebly.com/uploads/1/3/1/4/131437139/5491856.pdfIn PDF document text
    • https://kokejegifuro.weebly.com/uploads/1/3/4/4/134477846/9034818.pdfIn PDF document text
    • https://ziroluberunoreg.weebly.com/uploads/1/3/4/4/134456507/mefiribiluzisaz-ratogodakeveka-jitafogujoxi-lemevu.pdfIn PDF document text
    • https://jetujipizi.weebly.com/uploads/1/3/0/8/130813705/1347963.pdfIn PDF document text
    • https://tebojejuket.weebly.com/uploads/1/3/4/7/134764489/manamadasezop.pdfIn PDF document text
    • https://gabumisuxenumu.weebly.com/uploads/1/3/4/3/134366459/2865264.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386593/normal_5ff5047d828ce.pdfIn PDF document text
    • https://rixidagetowema.weebly.com/uploads/1/3/4/6/134612143/6025224.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370547/normal_5f94e62c6d7bc.pdfIn PDF document text
    • https://tewubituzidebu.weebly.com/uploads/1/3/4/3/134359488/dalazatotuditu.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/fatisake/pusagajukagorujav.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/monawofanoxatemerobu.pdfIn PDF document text
    • https://s3.amazonaws.com/dufekifaral/physics_combination_circuits_worksheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/bledsoe_custom_knee_brace_order_form.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_off00013c98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C98 5476 bytes
SHA-256: b9e29e4fb7be1471a6af4eeda919c329211397533bc4f116cb98346aa019e6c4
font_01_sfnt_off00014f24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F24 10988 bytes
SHA-256: 52770aa7b6eefbb1efed853938a2c7f7173cd09386324d750a50a59d9a73b498

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