Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ef0c8de2add6031…

MALICIOUS

PDF

91.5 KB Created: 2021-06-02 21:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 886ec2e8c67124e5092223bac6801fb9 SHA-1: c09cb67da407da08b69d406a590d24e4e92677d6 SHA-256: 6ef0c8de2add6031afa709e31aa29c1360ec1188af0fbcf83326b775d3d1505f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of embedded URLs and the overall structure strongly suggest this PDF is designed to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 6

  • 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 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
  • 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://crewmak.ru/pbw?utm_term=watch+citrus+anime+season+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383678/normal_6068a2ca09c41.pdfIn PDF document text
    • https://kogewovedof.weebly.com/uploads/1/3/4/3/134339257/difisovetizakan.pdfIn PDF document text
    • https://lirobepofuneve.weebly.com/uploads/1/3/0/7/130740173/9119637.pdfIn PDF document text
    • https://kodikitowi.weebly.com/uploads/1/3/4/7/134768405/bb8e3b73ea3f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455208/normal_5ffe0a10da7a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489241/normal_600b68e057a27.pdfIn PDF document text
    • https://tebebutak.weebly.com/uploads/1/3/4/7/134744698/rofunop-vodoroganamito.pdfIn PDF document text
    • https://buwofapakudo.weebly.com/uploads/1/3/5/3/135316190/mowisumodetule.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495395/normal_6034eb4dd6f79.pdfIn PDF document text
    • https://senorori.weebly.com/uploads/1/3/4/6/134641151/4540480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446026/normal_603af944829d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410000/normal_5ff16b54223af.pdfIn PDF document text
    • https://ronabamipiboti.weebly.com/uploads/1/3/4/5/134598089/92faa1e3c1435a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_603c6223aad21.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370051/normal_603812c578bf2.pdfIn PDF document text
    • https://minikugonon.weebly.com/uploads/1/3/4/5/134500064/xuboruxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_600b009fd9849.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/b7f0bb97-aaf1-44a0-93ac-4f65aa80f521/8640071474.pdfIn PDF document text
    • http://kolasotosexu.pbworks.com/w/file/fetch/144412143/vectric_aspire_3.0_keygen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/691e9947-8b2c-415a-9d32-7fb0e5398848/how_to_pressure_cook_chicken_ninja_foodi.pdfIn PDF document text
    • http://bukafag.pbworks.com/f/workouts_to_do_at_the_gym_for_weight_loss.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5ea671d-dccd-448c-8495-00e89aec567d/basazuvox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de5c5183-4b73-4ae4-8e28-d32afc3710a9/mafelapuw.pdfIn PDF document text
    • http://sisagexal.pbworks.com/f/el_romn_de_flamenca_libro.pdfIn PDF document text
    • http://xojipoxar.pbworks.com/w/file/fetch/144447690/80472727559.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac7099bc-9715-48fa-81f7-1a2938685d31/book_summary_rubric_middle_school.pdfIn PDF document text
    • http://savavaze.pbworks.com/w/file/fetch/144454518/65784426677.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_off00012a9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A9B 5152 bytes
SHA-256: 5dff4c8d89ae84237c87aab25b111444836d077d4ee0712213dca9c27cb7b2a3
font_01_sfnt_off00013bff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BFF 10704 bytes
SHA-256: caf36a65a2076fb466d1931a2812f2951c028e7cbc07a30d8afa12de2d507779

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