Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1e71a6c31c73662…

MALICIOUS

PDF

66.4 KB Created: 2021-06-02 07:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: a5f5249d77682d657336735bba148825 SHA-1: 1a1c6db0da7ee931ef22b700f15aa680a7ffccbb SHA-256: d1e71a6c31c73662b0408fb38b5bb0c5b0d46c4775b6e45a185439b306c45e85
184 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable hosting, indicating it is part of a link farm designed to manipulate search engine results or redirect users to malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9263

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://medvor.ru/pbw?utm_term=how+long+should+a+jenn+air+oven+last PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452154/normal_600611b5229c0.pdfIn PDF document text
    • https://dunelakanova.weebly.com/uploads/1/3/1/4/131410870/xiziwekuma-pokaxivepozite.pdfIn PDF document text
    • https://donokodupotev.weebly.com/uploads/1/3/4/3/134317189/bobegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458122/normal_601a06625bfc8.pdfIn PDF document text
    • https://galesarenad.weebly.com/uploads/1/3/4/3/134380117/guzibevibabus.pdfIn PDF document text
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/gares-bubopujatujemo-mogabujegeruje-mopemen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447265/normal_603c8a107e382.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4370269/normal_60b4b12ce9119.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5fe06dbf35ead.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/dd22a79a-83a4-45eb-9af6-4f8a55187a35/61493459593.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b489d5f3-6471-4628-95ab-9ad24f116cf6/frigidaire_dehumidifier_70_pint_parts.pdfIn PDF document text
    • http://sejuworepow.pbworks.com/f/gobuxasir.pdfIn PDF document text
    • http://kunixove.pbworks.com/f/atoms_elements_and_molecules_task_cards_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a4035b6-719a-4d4a-a278-77f1106e0ab4/18228448467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0c643f-488d-4496-823b-7d5034f4d165/research_proposal_template_apa_7th_edition.pdfIn PDF document text
    • http://bawamotijeku.pbworks.com/w/file/fetch/144478374/why_did_peter_say_to_jesus_lord_go_away_from_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b42cb095-3a3f-4222-adf5-fc54a785a861/digitech_gnx3000_price.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a769ba1-69b7-480b-b1dd-3954a172bd16/sony_vaio_desktop_hard_drive_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1feda81-1a5e-44b3-8e11-45d7933b06ab/pioneer_gm-a5602_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b229cec-3d08-43bf-83f2-52e4b2b2e226/how_to_pair_phone_to_delphi_radio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43f65967-d371-4e49-8469-d54c173537c6/16564915754.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/49219219142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/87a1d361-7242-49b6-b6e0-3050142a3c5f/23767525033.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e0e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0E8 5276 bytes
SHA-256: 1f639a4984e6f7e75e0e9f6552ac349375200b819f188c311c5eca01c80392d2

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