Malicious PDF — malware analysis report

Static analysis result for SHA-256 38773284d66ea1ab…

MALICIOUS

PDF

75.1 KB Created: 2021-06-03 20:56:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2dc588a4d9468f3d2af70bc207572325 SHA-1: cfb430d560dc96caf9f1b5031e75dfd3c239ea8b SHA-256: 38773284d66ea1ab1e7bf8f7577109355a1e79b2212009d4dc2785aebf82bb47
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm and is classified as malicious by ML and ClamAV. It includes an embedded URI pointing to 'bologen.ru', which is likely part of a phishing or SEO spam campaign. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content, potentially for credential harvesting or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/123?utm_term=doctor+office+sign+in+sheet+template
    • https://lularufopit.weebly.com/uploads/1/3/5/3/135326527/81d6673e8d5d5.pdf
    • https://fibepuranes.weebly.com/uploads/1/3/4/0/134041348/diwalufoxoz-manixuzisof.pdf
    • https://xojinumawot.weebly.com/uploads/1/3/4/3/134377449/a4d4dbfa8.pdf
    • https://jazemajotejavux.weebly.com/uploads/1/3/2/6/132681398/7496921.pdf
    • https://kasureketox.weebly.com/uploads/1/3/4/8/134856927/bc2e30609d9d.pdf
    • https://bumudipokipilu.weebly.com/uploads/1/3/4/3/134350227/fazapowagugamupot.pdf
    • https://wipabobape.weebly.com/uploads/1/3/5/9/135985954/tovogudarujemuvi.pdf
    • https://xelasukozulete.weebly.com/uploads/1/3/2/6/132681542/lopizapewo.pdf
    • https://betepojikimiji.weebly.com/uploads/1/3/0/8/130874485/susew.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/c42f1309-bf68-4a6c-84b8-aa6a803964c5/35330186144.pdf
    • https://uploads.strikinglycdn.com/files/88df8fb8-61be-41d2-a5ea-c35d4ed6b8e3/zikuvuzotuzopemuk.pdf
    • https://uploads.strikinglycdn.com/files/0945aa7d-a5a4-4f0e-af43-66a6050426d3/does_tessa_end_up_pregnant_in_after_we_fell.pdf
    • https://uploads.strikinglycdn.com/files/de668fa5-a218-4d74-83b7-96b51a7a6784/personal_pronoun_worksheet_for_grade_1.pdf
    • https://uploads.strikinglycdn.com/files/a03fe8e7-77cb-42c3-98dd-5efee7b5c823/us_army_recruiting_command_patch.pdf
    • https://uploads.strikinglycdn.com/files/ca145b7f-b2f0-4c62-8152-de3b7700b6f0/free_printable_student_information_sheet_for_teachers.pdf
    • https://uploads.strikinglycdn.com/files/0d38e8e8-7791-4f12-ad95-63da12551217/sizexep.pdf
    • https://uploads.strikinglycdn.com/files/5b5bc086-a444-4edb-9b05-b2a588d77c94/como_programar_en_c_c_y_java_deitel.pdf
    • https://uploads.strikinglycdn.com/files/506d982e-d34b-4b64-966a-5ac0b91b0b3b/wawitav.pdf
    • https://uploads.strikinglycdn.com/files/9637b45c-58c9-4270-abf3-26f02369d2e3/will_there_be_a_rangers_apprentice_movie.pdf
    • https://uploads.strikinglycdn.com/files/aa8f5dd1-9d48-43be-afc8-67338238e518/30709174622.pdf
    • https://uploads.strikinglycdn.com/files/a836d0a8-ce4d-442a-bac2-90575db52846/pemilaki.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e78b.bin
d247f85485ca20308196b5b80bde1d7f93b223be7544100917a857be013c7863		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 5428 bytes
font_01_sfnt_off0000f9e4.bin
9a73d25580541a239e65c1db5ff23ee9e6cccd8d9663c4e314b38418c1665ac6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 10400 bytes

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