Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6abb2f1dbb99df1…

MALICIOUS

PDF

78.4 KB Created: 2021-04-05 12:01:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f40a929061764bc5f9ced64be965e235 SHA-1: 12fae143d538cd05ab118ccb38a2b0815e34e652 SHA-256: f6abb2f1dbb99df169a65a62f570c84abb929b431fea87c6919e744f62b04b81
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 0.9992

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://nipisod.ru/123?utm_term=vivah+movie+songs+lyrics PDF link annotation
    • https://cdn.sqhk.co/rawatajizefu/4hdhhjb/robotics_engineer_salary_range.pdfIn PDF document text
    • https://cdn.sqhk.co/foseziwate/zf1hdia/bloons_td_5_monkey_lane_impoppable_guide.pdfIn PDF document text
    • https://vuloxeresipagig.weebly.com/uploads/1/3/1/0/131070754/rujikilenesuma.pdfIn PDF document text
    • https://rejobasagiletez.weebly.com/uploads/1/3/4/6/134642313/velajifififi-powop-renamuwusojig-morin.pdfIn PDF document text
    • https://mefimume.weebly.com/uploads/1/3/1/4/131437875/7411d6a934.pdfIn PDF document text
    • https://cdn.sqhk.co/jesovolavig/hhYTZuX/66141327667.pdfIn PDF document text
    • https://nezubarenegutel.weebly.com/uploads/1/3/0/7/130776328/8963170.pdfIn PDF document text
    • https://cdn.sqhk.co/gorokipo/oXNejgL/zujiwagomebitetuv.pdfIn PDF document text
    • https://fotelosalif.weebly.com/uploads/1/3/4/4/134463398/sisimodux.pdfIn PDF document text
    • https://cdn.sqhk.co/mowamukar/agcSpje/71735216572.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/iL4RZBj/nukib.pdfIn PDF document text
    • https://cdn.sqhk.co/kukabelek/hVgdQjd/fanatical_football_mod.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/1d2a2411.pdfIn PDF document text
    • https://cdn.sqhk.co/xogudililavo/jcZukhg/cartographer_noun_meaning.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/UNgiajc/bujimogenavuzuwepogesof.pdfIn PDF document text
    • https://xasejudezorakoz.weebly.com/uploads/1/3/0/8/130813307/wogagog.pdfIn PDF document text
    • https://gonelato.weebly.com/uploads/1/3/6/0/136082396/sebirurita-voxax.pdfIn PDF document text
    • https://zumikifekov.weebly.com/uploads/1/3/0/8/130813997/dudolowunoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://645c32c3-7e99-4959-b93b-7980205539d7.filesusr.com/ugd/30a31c_c00cd920623a4fbea62e32ed1d7c0646.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_bb688d2178c44e40a42b01a7f288d20c.pdf?index=trueIn PDF document text
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_60cb656c0e914ed7b0fc212c19628634.pdf?index=trueIn PDF document text
    • https://cdfb6f36-dde2-4af5-b3b7-55ff39976061.filesusr.com/ugd/c6ac46_733291142dbb41ad897567002efc2e3f.pdf?index=trueIn PDF document text
    • https://7f1888b6-cdab-4603-9914-1cf81a8b29aa.filesusr.com/ugd/6846fe_4f7974702a394666855ad6bbb5fdfc87.pdf?index=trueIn 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_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 5340 bytes
SHA-256: 05b8df63908af5b20da2da8eda022e2582f02f59d441c6b8c3831376aa144a68
font_01_sfnt_off0001069e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1069E 11076 bytes
SHA-256: 05535ffad3dea40fb6079f84207d1437ceae423d27d4881189e99f4a2b2b8155