Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecd93b9777a65879…

MALICIOUS

PDF

76.9 KB Created: 2021-06-05 15:50:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: af810cd9b116a29913d915cfcee83149 SHA-1: d616608f89af913b1f1a9fa295d915c9b45de233 SHA-256: ecd93b9777a65879165318f1616a0ed562ee4fd70e1b9ce467ddef0557e11c6a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to pbworks.com, suggesting a link farm or SEO manipulation tactic. The primary URL, https://drafthe.ru/pbw, is likely part of this scheme. ClamAV detected this as Pdf.Phishing.Trojan, and ML classifiers also flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, possibly to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://drafthe.ru/pbw?utm_term=how+to+cook+costco+frozen+edamame
    • https://gojanevalu.weebly.com/uploads/1/3/4/3/134353606/wenazafujuvosifej.pdf
    • https://gofizunesiwez.weebly.com/uploads/1/3/0/8/130874053/kivininewiranimelun.pdf
    • https://figiroxofidun.weebly.com/uploads/1/3/0/7/130740151/mawemijazu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://duziruromeja.pbworks.com/f/figafekokuk.pdf
    • http://tazijebep.pbworks.com/f/ladajaxekejijurijawiva.pdf
    • http://bezawagiga.pbworks.com/f/68773543820.pdf
    • http://jozeluwofe.pbworks.com/w/file/fetch/144618882/98946682815.pdf
    • http://ganosidil.pbworks.com/w/file/fetch/144637284/gb_whatsapp_terbaru_juni_2020_apkpure.pdf
    • https://uploads.strikinglycdn.com/files/2ca36ae0-9f0b-425c-8148-bc204340cdf5/pit_bike_125cc_big_bore_kit.pdf
    • https://uploads.strikinglycdn.com/files/b27e3518-5544-4d64-90fd-0a3278799979/how_to_change_local_user_password_in_windows_server_2012_r2.pdf
    • http://xifatarege.pbworks.com/w/file/fetch/144550419/multiplication_table_1-20.pdf
    • http://lojefizowoj.pbworks.com/f/tonosedogebudu.pdf
    • https://uploads.strikinglycdn.com/files/a745cfe3-62f2-41c4-86d0-228a77b3065c/who_makes_clutch_energy_drink.pdf
    • https://uploads.strikinglycdn.com/files/6428e51f-b508-4242-bfc3-8799533477e5/61926991638.pdf
    • https://uploads.strikinglycdn.com/files/e2d9944e-43b6-47aa-8d79-020951cce1cf/kusopezufa.pdf
    • http://lopofemusun.pbworks.com/f/64492186435.pdf
    • https://uploads.strikinglycdn.com/files/a546e647-6d4f-40bc-b6f8-ffe365205da2/ged_rla_practice_test.pdf
    • http://fogofalo.pbworks.com/w/file/fetch/144548205/37895757281.pdf
    • https://uploads.strikinglycdn.com/files/e271e453-438d-4f21-a716-4876c4a01240/49674030767.pdf
    • http://zepupifob.pbworks.com/w/file/fetch/144564765/perspective_drawing_book_free_download.pdf
    • http://togusan.pbworks.com/w/file/fetch/144613743/65296529773.pdf
    • http://mibegenav.pbworks.com/f/90297808777.pdf
    • https://uploads.strikinglycdn.com/files/8931e71b-cc6e-4502-8897-4b5f3abfa2dd/how_to_translate_your_name_into_korean_name.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_off0000e4da.bin
2409a5c4e36b551c98d01f1358c26f80eef9e0cd966d3cb8723b7e6a2884a877		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE4DA 5304 bytes
font_01_sfnt_off0000f6e6.bin
a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E6 1800 bytes
font_02_sfnt_off0000ff73.bin
0c79a331932e5681a7e9877de1a7fefa9d57dd1f35dc10c5c0047a8ce8d0e387		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF73 11208 bytes

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