Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ff91791bcc3df51…

MALICIOUS

PDF

77.9 KB Created: 2021-03-07 10:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d3d1722ecf493722a6af89b1023b804f SHA-1: d5e63b693cfa0bde69cebeb66c4da4050550cac2 SHA-256: 0ff91791bcc3df514131a9f4cd7f288a8c1e1918a83a7f5b130666f9eca1e1b6
186 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 disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to host malicious content or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xezojetit.ru/aws?utm_term=black%252Bdecker+rcs614+rice+cooker+14-cup+with+saute+function PDF link annotation
    • https://pujapuvefebawu.weebly.com/uploads/1/3/4/5/134581836/juxikelez.pdfIn PDF document text
    • http://allieshouseofhope.com/fisher_and_paykel_spare_parts_near_mer0zyg.pdfIn PDF document text
    • http://wide-take.top/hacker_mod_for_minecraft_pejtq66.pdfIn PDF document text
    • http://virona.org/kudekitadutinidixeximej3gcwu.pdfIn PDF document text
    • https://cdn.sqhk.co/tezasevimab/jegjjja/granny_horror_map_mcpe.pdfIn PDF document text
    • https://xefewovureku.weebly.com/uploads/1/3/4/2/134265706/04229f.pdfIn PDF document text
    • http://lnstagramverifiedbadgeshelpcenters.net/lepilunuvapomimozuwoxobuj4bhf.pdfIn PDF document text
    • http://ellmax-site.xyz/mopupafugamedaln9y.pdfIn PDF document text
    • http://13millions.store/nupirajukujinoguwarejubuxw6vu4.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/Kfhdhij/trail_run_shoes_review.pdfIn PDF document text
    • https://sodikisug.weebly.com/uploads/1/3/1/4/131437766/timorevibupona-taxumug-kovebukipixuto-koziwobosijadud.pdfIn PDF document text
    • http://24goodstore.site/crooked_kingdom_book_summarys2dev.pdfIn PDF document text
    • https://cdn.sqhk.co/zegofurop/fqgeAjc/88119385480.pdfIn PDF document text
    • http://microbladingcertificationdfw.org/77121776141gdlon.pdfIn PDF document text
    • http://oneshops.space/pretty_little_liars_season_7_episode_209a5ph.pdfIn PDF document text
    • https://puwibovur.weebly.com/uploads/1/3/4/6/134639487/xudewaziparisuraso.pdfIn PDF document text
    • https://dupemokuko.weebly.com/uploads/1/3/4/7/134759865/6241847.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc6b22d1-fd3c-476a-b8f1-b0505981f591.filesusr.com/ugd/ab5adf_4c312c17591f494c9b6ebfa54798c72f.pdf?index=trueIn PDF document text
    • https://ff0b3df2-dc61-4aeb-9024-93fa9b5bc175.filesusr.com/ugd/aa14a9_27d2690ad1a2469bae8743679c1e2248.pdf?index=trueIn PDF document text
    • https://8d94caac-80d5-4f6d-a73a-04ed47837dc1.filesusr.com/ugd/585b1d_012cc0f196144e03b7bf8b08643593f9.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_off0000f13f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 5772 bytes
SHA-256: d5c469ea2e304488ebd2486643f89aff1e0884f0b34fd653e3facf003ddae5c0
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10816 bytes
SHA-256: efda46428d142e1f714457145f4919a1baf0f0dbd2a989e79ce81850af70c5a9