Malicious PDF — malware analysis report

Static analysis result for SHA-256 afc74a78b13cd527…

MALICIOUS

PDF

76.5 KB Created: 2021-02-24 16:43:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 027593dd62c7f789c460c1e8e11c2da2 SHA-1: 4445433a26b449055c4d38cff457d66c5dfa199e SHA-256: afc74a78b13cd527b9eb6395a92ef366d566b669864eb91ed6066e6129c5f0fe
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting and are designed to redirect users to other sites. One URL is explicitly flagged as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

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://crophysi.ru/wix?keyword=geometry+proofs+with+parallel+lines+worksheet In PDF document text
    • https://cdn-cms.f-static.net/uploads/4387046/normal_5fdb0c5db9488.pdfIn PDF document text
    • http://pugumatinudozid.iblogger.org/safety_data_sheet_format.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/41301688316.pdfIn PDF document text
    • https://visimekariluvog.weebly.com/uploads/1/3/1/4/131483525/7796213.pdfIn PDF document text
    • https://ginimowawogob.weebly.com/uploads/1/3/4/7/134753870/082795406cf8da.pdfIn PDF document text
    • https://lezuzanufebaj.weebly.com/uploads/1/3/4/8/134873312/b5dcfa3de66b6ee.pdfIn PDF document text
    • https://dotaterezisal.weebly.com/uploads/1/3/4/7/134771172/wulitibatupal_lojegu_kisedazupi.pdfIn PDF document text
    • https://tikuvafijosil.weebly.com/uploads/1/3/4/6/134685963/sugokigixonatipepi.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/nokowolawolivadavunawefi.pdfIn PDF document text
    • https://taduvovu.weebly.com/uploads/1/3/1/8/131871704/f8e6e7ccb4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456377/normal_600096b885b7e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bevamixebigal.epizy.com/audi_a6_2014_manual.pdfIn PDF document text
    • http://gurabagoderes.atwebpages.com/is_vedic_astrology_more_accurate_reddit.pdfIn PDF document text
    • http://vudexejuvejutek.rf.gd/topological_data_analysis_tutorial.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_off0000e512.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE512 5428 bytes
SHA-256: 096d1c6b3761d10229798aca3792111b5c3a768c2fb5b8920f021f1ea73d1e89
font_01_sfnt_off0000f77d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF77D 14208 bytes
SHA-256: 7e2efb28e904f0220a592fc82f230eaa1c9a77876d2815cf9342968dd93ce60a

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