Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5dc4b7ec5424c4…

MALICIOUS

PDF

74.6 KB Created: 2021-03-19 17:26:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b7f263ab8d0d54201e9d5ce78b5638f1 SHA-1: 6f8eb905566e51e3974a09fdbe16f50b0cc5e081 SHA-256: dc5dc4b7ec5424c4df7c3b6e850ee1e61cfd591d1edeebdaddda6154f8190fdb
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external URLs pointing to various domains, some of which are hosted on disposable platforms. The primary purpose appears to be directing users to external content, potentially for phishing, malware distribution, or SEO manipulation, rather than containing exploitable content directly within the PDF itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://vilenefex.ru/wix?keyword=fixer+upper+divorce+reddit PDF link annotation
    • https://cdn.sqhk.co/gibewuzavi/lFG7iib/unicorn_dash_magical_sky_game_download.pdfIn PDF document text
    • https://cdn.sqhk.co/rowalulo/jgjjage/35602238132.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/hbhgiiX/angry_birds_blast_level_459.pdfIn PDF document text
    • https://biwezufum.weebly.com/uploads/1/3/4/8/134872286/pewusefoxik_fimexu_dutawidelixi.pdfIn PDF document text
    • https://cdn.sqhk.co/dofofoziga/aOjgmig/29006502335.pdfIn PDF document text
    • http://maslovauto.ru/physics_for_global_scientists_and_engineers_volume_29l5co.pdfIn PDF document text
    • http://moxegelubopidi.sportsontheweb.net/letter_of_intent_for_turkey_scholarship_sample.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/jThyVIo/nadopogo.pdfIn PDF document text
    • http://xuribof.medianewsonline.com/betiruzugoxem.pdfIn PDF document text
    • http://italdom.fun/hazop_reportzosiu.pdfIn PDF document text
    • http://nat-yoga.space/what_kind_of_drugs_are_tricyclic_antidepressantsml5y3.pdfIn PDF document text
    • http://olx-delivery.cc/runumaxebajamavasomuvurvdt.pdfIn PDF document text
    • https://pivamuwonojazop.weebly.com/uploads/1/3/0/9/130969183/velip_najuga.pdfIn PDF document text
    • https://gilitizek.weebly.com/uploads/1/3/4/1/134131368/4780764.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/hrIOwyR/62311860208.pdfIn PDF document text
    • https://cdn.sqhk.co/jelasusoved/j9jjif9/fefeseribodufaxabuwolas.pdfIn PDF document text
    • https://jalupibu.weebly.com/uploads/1/3/4/5/134520797/80701.pdfIn PDF document text
    • https://cdn.sqhk.co/gomurabog/iebji4T/statistical_inference_text_book.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/1244944.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e74a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 4732 bytes
SHA-256: c55c9066e1a91bc4155a08aeb7758055a415fd269f21bb3a419ff83bcaac8e07
font_01_sfnt_off0000f783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF783 11148 bytes
SHA-256: b81ba02dc9f0e40cc772afefa79b1363b428574ffaf21b1197242b65108f101f

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