Malicious PDF — malware analysis report

Static analysis result for SHA-256 d934d70e1081e5ea…

MALICIOUS

PDF

80.4 KB Created: 2020-12-31 17:59:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 487c1d35ee0e05d7d077cd31094704ff SHA-1: 40520886288a8cc6804fb02137107b1786b2732f SHA-256: d934d70e1081e5ea7d2ea2f947d2dbd98937dde27832c69d0b0f5599d6e3ff47
244 Risk Score

Malware Insights

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

The sample was identified as malicious by multiple heuristics, including PDF_MALICIOUS_REDIRECTOR_LINK and ML_NYX_PDF_MALICIOUS. It functions as a link farm, containing numerous embedded URLs pointing to external PDF files hosted on various domains, many of which are disposable. One URL, https://cctraff.ru/wb?keyword=evolution%20definition%20biology, is flagged as a malicious redirector.

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://cctraff.ru/wb?keyword=evolution%20definition%20biology In PDF document text
    • https://cdn.sqhk.co/reretukida/ie56gj9/wejozejiwaw.pdfIn PDF document text
    • https://cdn.sqhk.co/gasubapo/g3ifApf/mivokexelewo.pdfIn PDF document text
    • https://benipotuwazel.weebly.com/uploads/1/3/4/4/134445242/fusuritakalifewi.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/4e1171732ae79d2.pdfIn PDF document text
    • https://cdn.sqhk.co/kurinunuwor/gnChije/guwiludisugodezawol.pdfIn PDF document text
    • https://mipurokuniveg.weebly.com/uploads/1/3/4/5/134508865/3a0d2.pdfIn PDF document text
    • https://wanomumopanud.weebly.com/uploads/1/3/1/3/131379193/biwuzitifoji.pdfIn PDF document text
    • https://pinababinazu.weebly.com/uploads/1/3/2/6/132695354/3229271.pdfIn PDF document text
    • https://cdn.sqhk.co/bixatavafut/F3jdvia/pentagon_federal_credit_union_jumbo_mortgage_rates.pdfIn PDF document text
    • https://dexulivixuwe.weebly.com/uploads/1/3/0/7/130739852/9105073.pdfIn PDF document text
    • https://supidopize.weebly.com/uploads/1/3/4/5/134521205/kagipurimi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jokotaziweluge/xulejelonefi.pdfIn PDF document text
    • https://s3.amazonaws.com/gavexilatuvitaz/2018_tamil_panchangam_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/tetofamuxulil/catiline_ibsen.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_off0000ff36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF36 4848 bytes
SHA-256: 6bffeb5dae4273fc9d6e199b82e99a792e3be26943f32b1d91efc87500570898
font_01_sfnt_off00010fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE4 10792 bytes
SHA-256: 3b850a440ba845272931eca044b4155a73c3e331c6a4e9fa7192317fe8be8e44

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