Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b65bc760bcaabc9…

MALICIOUS

PDF

67.6 KB Created: 2020-11-11 05:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 7dc6ba53a0afea1ec2b9d572469a04cb SHA-1: 78f853c7c4edec2286e2086b8026c8f928f9bd86 SHA-256: 9b65bc760bcaabc98cdbf28cf96eb68f1801d205fbde0f66ad3dc4dc85ade29b
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable hosting services, indicating a link farm designed to manipulate search engine results or redirect users to malicious sites. One critical heuristic identified a link to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

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://ggtraff.ru/123?keyword=technology+advancements+after+ww1 In PDF document text
    • https://jalewigevat.weebly.com/uploads/1/3/2/6/132681207/064c128cb.pdfIn PDF document text
    • https://fogajabewe.weebly.com/uploads/1/3/4/1/134131707/rugilagigofupisa.pdfIn PDF document text
    • https://sokegipamemaxo.weebly.com/uploads/1/3/4/3/134345901/kixege.pdfIn PDF document text
    • https://zisaneviz.weebly.com/uploads/1/3/4/3/134319132/bazaluvofob.pdfIn PDF document text
    • https://xonuveviriniw.weebly.com/uploads/1/3/0/7/130738603/1ec2414c2.pdfIn PDF document text
    • https://fegilekupajot.weebly.com/uploads/1/3/4/4/134404616/3128669.pdfIn PDF document text
    • https://sawuraba.weebly.com/uploads/1/3/4/7/134720576/kanuzowixowu_pireda.pdfIn PDF document text
    • https://venatijaw.weebly.com/uploads/1/3/4/6/134680547/mexebideboniwez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366358/normal_5f89b8beca707.pdfIn PDF document text
    • https://tejovobomogopiz.weebly.com/uploads/1/3/4/6/134626725/sejepoketiperide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382638/normal_5f9e38e19bbc1.pdfIn PDF document text
    • https://tabefelob.weebly.com/uploads/1/3/4/3/134372343/1014980.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/ec0d6790-eea1-4985-b5fb-25b27d94b646/thucydide_la_guerre_du_ploponnse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7374b095-1a59-4751-8240-b07514cfdec4/suwisesumiguzokubagagekel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2358595a-adb7-4c7e-b1c1-c664bbdb4344/buy_here_pay_here_car_dealers_wilmington_nc.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_off0000ca20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA20 5692 bytes
SHA-256: 5e749384de93f33b1d6f954e92fc69c29cea4073d0a4c0a5d7648634a97887da
font_01_sfnt_off0000dd73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD73 10696 bytes
SHA-256: a76d364a5d773a4f5ac5b9c4e3fcba0c42ed8614cdb287bf3e167d16e5174ff2

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