Malicious PDF — malware analysis report

Static analysis result for SHA-256 34cf0b8e37ab34c3…

MALICIOUS

PDF

68.9 KB Created: 2021-01-06 08:52:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 7fbf7325222b4f03b0b1f59fcefc9fbc SHA-1: 269231324173e464c7d41d06782486ee98763ed3 SHA-256: 34cf0b8e37ab34c39741826119708046d2008755d6adf41974b6e4a566ea7c8d
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure and a high ML score. The document contains a large number of embedded links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The ClamAV detection further supports its malicious nature.

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://gettraff.ru/wb?keyword=how%20to%20remove%20smd%20components%20using%20soldering%20iron In PDF document text
    • https://cdn-cms.f-static.net/uploads/4408346/normal_5fdc4080cb6cc.pdfIn PDF document text
    • https://pisanofinupu.weebly.com/uploads/1/3/1/4/131437881/3536370.pdfIn PDF document text
    • https://donikigegetala.weebly.com/uploads/1/3/4/3/134311768/6d1d46a9ce1.pdfIn PDF document text
    • https://zujolifuwumew.weebly.com/uploads/1/3/4/7/134773321/2db22558ad6.pdfIn PDF document text
    • https://risimukino.weebly.com/uploads/1/3/1/3/131383953/wupefekarasewutelut.pdfIn PDF document text
    • https://lurexiji.weebly.com/uploads/1/3/4/5/134594132/9177402.pdfIn PDF document text
    • https://gupaxapofigovi.weebly.com/uploads/1/3/4/3/134356466/gunakexi.pdfIn PDF document text
    • https://moxitasa.weebly.com/uploads/1/3/1/4/131454719/kiremupis.pdfIn PDF document text
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/ritifagasijawik_bibor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463277/normal_5fd165f50d9a4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9df4e77b-e217-4d5c-9257-f9ad85bb67ad/pabozopazejobenesegun.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/javavageximelibirokazo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99e851ec-13bc-4f26-90da-cc203d1e5935/fuditovimakejawig.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/83729762509.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_off0000d0a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A8 5296 bytes
SHA-256: 6bf1fc9e7646c3117cb64eeff9970123a3fd7f5035c912778cbc79882438d4c1
font_01_sfnt_off0000e2af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2AF 10488 bytes
SHA-256: 09fff0a22711947dde72a19411bc2050413b5ebd2ad917ea3339aeaf4bec3e54

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