Malicious PDF — malware analysis report

Static analysis result for SHA-256 f603d8204330050a…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 23:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: da6a62755f7f579e2e28cfa46f2488d3 SHA-1: dccee661358e4438cfbbbdb35cd6288021513815 SHA-256: f603d8204330050ad4e85579db016ac78857057d5b75731edbb72037530b1533
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=hssc+laboratory+attendant+online+form PDF link annotation
    • http://zamowafa.mywebcommunity.org/disgraced_play_essay.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/Jogcphc/91816100046.pdfIn PDF document text
    • https://komuwewolidixat.weebly.com/uploads/1/3/4/8/134871085/1bc3d56b3f8be.pdfIn PDF document text
    • https://sazulolako.weebly.com/uploads/1/3/1/4/131453808/2f77ff84523.pdfIn PDF document text
    • https://kirorasonosa.weebly.com/uploads/1/3/4/7/134743937/xabilixotak.pdfIn PDF document text
    • https://cdn.sqhk.co/mujekesire/ijiinW8/nadebudigipozulexek.pdfIn PDF document text
    • https://laxuwipulave.weebly.com/uploads/1/3/5/9/135956831/452809.pdfIn PDF document text
    • http://nomenowunesazoz.scienceontheweb.net/44134286438.pdfIn PDF document text
    • https://cdn.sqhk.co/gisusisabez/XsALkN5/62522190760.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/hjaRIxX/11141462227.pdfIn PDF document text
    • https://cdn.sqhk.co/molavagew/c9iaZha/97493300658.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://punotonaduwize.atwebpages.com/romeo_and_juliet_leonardo_dicaprio_full_movie_streaming.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e116237a-5986-432c-953f-c4c200e72eb5/nudomabegomenilo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df130b39-aaa2-489e-b79b-c8b1df97b265/nuluwoninef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3da58f84-2623-45e8-97f0-25a0544fdc25/86804367661.pdfIn PDF document text
    • https://s3.amazonaws.com/pizivurapab/notiminafomuwotogol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84a54b7a-6295-4539-a216-2497b5ed545a/4015859008.pdfIn PDF document text
    • https://s3.amazonaws.com/legapatatezisa/borukegasiripoli.pdfIn PDF document text
    • https://s3.amazonaws.com/jobavo/52446935188.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/basic_confidentiality_agreement_template_australia.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_off0000e22d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22D 5372 bytes
SHA-256: ecd01ffceddd2bf876152dd5ea97a8d8c6cc203bbfcc53d30fff1f258feb10d2
font_01_sfnt_off0000f462.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF462 10452 bytes
SHA-256: f760a5d4f5bfaa9aec12577d2bd60e1884a6e65c86bd3d27b19e5028f9638f7f