Malicious PDF — malware analysis report

Static analysis result for SHA-256 a16410a9899a0b8d…

MALICIOUS

PDF

69.9 KB Created: 2021-05-28 08:52:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9edc71404a13bdbbe3d9d3ef4b757dd0 SHA-1: a387593eb50116f6f30e950f6721a62927b5c6ed SHA-256: a16410a9899a0b8d27f5f8551a1372f13b3d26ef322e98377412cb7037dcb315
186 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 0.9998

Heuristics 6

  • 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
  • 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://ponafet.ru/123?utm_term=erik+satie+gnossienne+3+sheet+music PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4454277/normal_5ff691c428361.pdfIn PDF document text
    • https://kiwotatuna.weebly.com/uploads/1/3/1/8/131856308/zeripejojakefinibux.pdfIn PDF document text
    • https://fuvodaxe.weebly.com/uploads/1/3/1/3/131379021/6433743.pdfIn PDF document text
    • https://rulodewarozuw.weebly.com/uploads/1/3/4/6/134678260/ribavixemufuzajawi.pdfIn PDF document text
    • https://jasujidavoja.weebly.com/uploads/1/3/4/7/134770870/369fe2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460048/normal_60031c2d780e0.pdfIn PDF document text
    • https://dijitisabotiji.weebly.com/uploads/1/3/5/3/135324222/252452.pdfIn PDF document text
    • https://rajawanog.weebly.com/uploads/1/3/5/3/135320481/dd577bb20.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426407/normal_5fe0d316dc495.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/powomikolekuminan.pdfIn PDF document text
    • https://sibabaku.weebly.com/uploads/1/3/0/7/130739132/tikedaxijenijupebe.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/b9650bc2-7a6f-446a-a87d-9d669638db7a/commonly_confused_words_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3ed3c9b-adbd-41e7-aad9-f7f7dc9f091a/rousseau_social_contract_book_3_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77a9341f-2be9-4717-8eb6-5e153f50702e/jowowibafogapuwikonoburaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8352285b-12f7-43bd-8613-0680c9c57b3d/hp_laserjet_1100a_driver_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db4eb59d-284e-436a-93b0-c0d7398cd632/19259063357.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2fd550-97fe-42f1-b4f2-004629ecdc96/challenge_war_of_the_worlds_2_episode_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f712f85-9e47-4740-85c5-79f97a88140c/cost_of_easi_joists.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_off0000d1be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1BE 5364 bytes
SHA-256: 7782b9beb4cc6d1a181e5d27519a69ce9054cd4831f4157b85e84575846cfaeb
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 11468 bytes
SHA-256: 83585b4c9dd01028831dc52de7daa27dce9e43d445a07b0fe1ba358c75f7d08a