Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd574e1304029055…

MALICIOUS

PDF

74.1 KB Created: 2021-02-27 11:43:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: db014041159521a9df9dc3aa30638f2b SHA-1: ffc37b4ebd119443d465e1b285d6b3a04f31f395 SHA-256: cd574e1304029055c913fd0f19db80c0c43edd98182cbabe3632d1f6a62f2c36
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers strongly suggest malicious intent, classifying it as a phishing or trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://xezojetit.ru/aws?utm_term=what+are+the+steps+in+training+and+development+process PDF link annotation
    • https://vafiradas.weebly.com/uploads/1/3/3/9/133988778/xemapelonirawef.pdfIn PDF document text
    • http://gaydating.world/savosuvugivemazibugego92v13.pdfIn PDF document text
    • https://vabusidi.weebly.com/uploads/1/3/4/7/134765039/lodikekotubor.pdfIn PDF document text
    • https://ripodomix.weebly.com/uploads/1/3/0/7/130775876/gefuwujoluferojunuro.pdfIn PDF document text
    • http://workshop-fb.ru/happy_teachers_day_greetings_imagest8wj2.pdfIn PDF document text
    • http://xenalebosob.scienceontheweb.net/88020480387.pdfIn PDF document text
    • http://gramnews.xyz/ikea_malm_bed_headboard_hack9mhme.pdfIn PDF document text
    • http://lizoguxumugef.mywebcommunity.org/how_to_learn_animation_for_beginners.pdfIn PDF document text
    • http://naturagrush.space/60338905268g15fn.pdfIn PDF document text
    • https://dumidonawusirug.weebly.com/uploads/1/3/5/3/135306770/fe53a.pdfIn PDF document text
    • http://pawezujexas.mywebcommunity.org/putavugusosorejulu.pdfIn PDF document text
    • https://muduzefob.weebly.com/uploads/1/3/4/0/134018051/ditowedidix.pdfIn PDF document text
    • http://trokot-new.online/putil5ucyh.pdfIn PDF document text
    • http://azakalaza3.xyz/64941187228urxsn.pdfIn PDF document text
    • https://mubajodopiwal.weebly.com/uploads/1/3/1/4/131454521/jojesiwe.pdfIn PDF document text
    • https://kunatelifarak.weebly.com/uploads/1/3/2/7/132712072/4388548.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_off0000e574.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE574 5560 bytes
SHA-256: 16542ee9588b8a303f88ea6e2163e8c2f25c2b14e37e84d7a659438068962f8b
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 10216 bytes
SHA-256: 719f2f4e879837350aac54f9308b0ab32dc4878c2fedc3a2929cc372850859c3

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