Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fd43c4a4bcb6cf3…

MALICIOUS

PDF

77.7 KB Created: 2021-02-21 18:51:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ebd12f826b675669ba1b4b808e5c6d29 SHA-1: e2a8cef6e5a4509fb7c284c488989cd908f7beb1 SHA-256: 3fd43c4a4bcb6cf339e15572ef25e92830767cf8f3bdde296872919356112417
284 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a significant number of embedded links, many pointing to disposable hosting, and one critical heuristic indicates a payment redirection lure. The presence of a malicious redirector link further supports the malicious intent. While no scripts were explicitly extracted, the PDF structure and link farm suggest an attempt to drive users to external malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://yafferge.ru/aws?utm_term=ashrae+handbook+of+fundamentals+r-values In PDF document text
    • https://lejumapufa.weebly.com/uploads/1/3/4/6/134688193/2380384.pdfIn PDF document text
    • https://soregekewo.weebly.com/uploads/1/3/4/2/134266411/nupujal.pdfIn PDF document text
    • http://creditscoreusa.info/formel_reaktionsweg_gefahrenbremsung1lmz9.pdfIn PDF document text
    • http://consequences.space/74218197353vwgws.pdfIn PDF document text
    • http://zebizekesodu.iblogger.org/ruvujewoliwimanakim.pdfIn PDF document text
    • https://xevibobi.weebly.com/uploads/1/3/4/6/134683071/1242724.pdfIn PDF document text
    • http://speak4pro.com/minecraft_horse_stable_pea0k6s.pdfIn PDF document text
    • https://poxagubojawi.weebly.com/uploads/1/3/1/4/131482812/midukedirutafajew.pdfIn PDF document text
    • http://petrol-v-pol-price.site/87107296849e716u.pdfIn PDF document text
    • https://kujegafibez.weebly.com/uploads/1/3/4/2/134265926/e054489942134d.pdfIn PDF document text
    • https://letuwolisabir.weebly.com/uploads/1/3/4/6/134602086/443711.pdfIn PDF document text
    • http://ins.expert/telafiridalinejbqms0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujusama.rf.gd/zinajaxose.pdfIn PDF document text
    • http://fetapewifug.epizy.com/gunibevixofare.pdfIn PDF document text
    • http://rusakarazixano.epizy.com/53337454927.pdfIn PDF document text
    • http://wasalesex.epizy.com/61391176065.pdfIn PDF document text
    • http://xazabivi.epizy.com/crystal_oscillator.pdfIn PDF document text
    • http://nulebizazawivuk.epizy.com/critical_review_of_the_stranger_by_albert_camus.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_off0000f012.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF012 5432 bytes
SHA-256: 6128b41bb17eab115ff041112430996623c1f5f460caafbf4588c8703c21afd1
font_01_sfnt_off0001026e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1026E 11032 bytes
SHA-256: 579920d6f21521e7c8ecd8f58aa376cbdbaaada489342e96934bcb67b9c5d352

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