Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac9e398cfe4d5467…

MALICIOUS

PDF

78.9 KB Created: 2021-06-04 04:21:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2f764fceb189795b71eed59f1bdf4f72 SHA-1: cb71cdba06bc3e53d9c2f519e0ccbb4f1f1d920d SHA-256: ac9e398cfe4d5467912ca10313729ffa622b30495d610b121b099a997e94b9a5
156 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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://philabc.ru/pbw?utm_term=mechanics+of+materials+8th+edition+solutions+chegg PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501632/normal_60b8b5f62abc4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_605dcef463d24.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447880/normal_60530ed981aca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367310/normal_6006bd2d0714a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414156/normal_6048a7148e580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379236/normal_604873a0e8ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421468/normal_60678bcb7d24c.pdfIn PDF document text
    • https://nowitijot.weebly.com/uploads/1/3/4/7/134716658/binex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5fffa64572598.pdfIn PDF document text
    • https://lukimozogu.weebly.com/uploads/1/3/4/6/134638062/e4b58.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/ed0e41e7-f424-4278-acea-b590d9cbf5be/jenn_air_gas_cooktop_replacement_parts.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e50680ae-e8b2-419b-9c4c-e00950abd7cd/88834069931.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834d563a-763f-477a-a1a9-e9f502040f7d/black_boy_chapter_11-14_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3f7aa609-1ccc-4789-bdb0-726a144de1ed/regenezogejarunopemej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd917001-21b6-4eb0-8e66-6018c59ed5ca/40970901100.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08a365e7-9086-44a6-a866-16198f26a903/bridesmaids_movie_in_hindi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5a8c467c-fc88-404d-b4b5-9be2e9aedc82/74860206318.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/642efcea-af79-49aa-bb57-be5671c3dede/saxidaxupore.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b1feb362-cfeb-4194-8d3b-957410af0f63/sasajuzebaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/51016a86-df72-4352-9131-f34f990c3c9e/kolizugokulejedakoxaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b867c0f4-151b-44fb-8a40-79537ede215e/hepta_the_last_lecture_full_movie_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f87aef3e-bb2b-41b9-b657-17899c762162/what_is_the_best_smart_irrigation_controller.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9d98513-9544-4411-bbe7-b9119fddd4d0/extended_metaphor_meaning_in_urdu.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f832.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF832 5632 bytes
SHA-256: c11e82a8cbc07c465580c53c18792234a8a9537ed524f697315c9433d25a3d21
font_01_sfnt_off00010b38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B38 11116 bytes
SHA-256: de4c13ba8987214f589012851ef6d0e1d4e71964504d9d5ce08dff445baceaf2