Malicious PDF — malware analysis report

Static analysis result for SHA-256 64d1558df9e9a163…

MALICIOUS

PDF

80.5 KB Created: 2020-11-20 08:44:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fbf64762e4facbfadd1812d1d01a0ba2 SHA-1: 7be51082f0db6f3454ef89559412c4fdb68c412c SHA-256: 64d1558df9e9a163a863e218634e2fb7850cbadc31aa7c9c99cf7770c4a1ef79
244 Risk Score

Malware Insights

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

This PDF file is identified as malicious by multiple heuristics and an ML classifier, specifically flagged as a redirector and a link farm. It contains numerous embedded URLs pointing to external sites, with at least one identified as a known malicious redirector. The document's primary function appears to be to lure users into clicking these links, likely leading to further malicious content or phishing attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffmen.ru/aws?utm_term=momentum+calculations+worksheet+with+answers
    • https://rigokapine.weebly.com/uploads/1/3/4/5/134593974/2315318.pdf
    • https://sokuvotaboraj.weebly.com/uploads/1/3/0/7/130776263/47292360a0.pdf
    • https://nudomituge.weebly.com/uploads/1/3/4/6/134677479/palosanoka.pdf
    • https://funovupudejo.weebly.com/uploads/1/3/4/4/134473131/genexalamax.pdf
    • https://digonowokeke.weebly.com/uploads/1/3/1/8/131856318/kulow.pdf
    • https://bibitoxi.weebly.com/uploads/1/3/4/6/134653780/968f46b79241.pdf
    • https://sabijodamibig.weebly.com/uploads/1/3/0/7/130775907/pipogowe-xenemezidaf-bukinebe.pdf
    • https://lodiwuziwinum.weebly.com/uploads/1/3/4/5/134502140/9944327.pdf
    • https://tanezogifa.weebly.com/uploads/1/3/4/3/134321065/tumodifado.pdf
    • https://defifipak.weebly.com/uploads/1/3/4/4/134442047/nekugulunorixu_murotavadofa_nopawukabemom_dofedabe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e229a030-774c-4a1c-9dab-cd72100e0761/bonivixalukawopuxufixezap.pdf
    • https://uploads.strikinglycdn.com/files/7f4645ad-fc76-4b66-a889-050ef1e3c5a5/1487907500.pdf
    • https://s3.amazonaws.com/gezetega/xejaxew.pdf
    • https://s3.amazonaws.com/bizamesuwepe/35922581109.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f388.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF388 2828 bytes
font_01_sfnt_off0000fd83.bin
19993246260e09f961e79fc3e9c0c948cc249cbe988a9d31a206ef3f13dc7447		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD83 5200 bytes
font_02_sfnt_off00010f1d.bin
86d4cbdd561c40fffd51e1a43f1b53cb2bcd0e4bd751bb60836d9df764cdaef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 10456 bytes

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