Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab5916216d21e40e…

MALICIOUS

PDF

81.1 KB Created: 2021-05-15 14:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 2d64b6f1051fc44b4b206f0bdd29175b SHA-1: ddc48f80cdd706b9837198315d0ecc85f4098ee9 SHA-256: ab5916216d21e40e6c8b1eaedcce11e622f0e849aba9f4cf83c9cbea17311be7
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 0.9997

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://pelibifir.ru/strik?utm_term=what+is+the+theme+of+the+last+leaf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376598/normal_60151169bc131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485800/normal_605f5a5686da0.pdfIn PDF document text
    • https://zuparimetusu.weebly.com/uploads/1/3/1/3/131378993/sivopi-losumutinusuni.pdfIn PDF document text
    • https://gupexududoteg.weebly.com/uploads/1/3/5/3/135302954/2242705.pdfIn PDF document text
    • https://cdn.sqhk.co/doburazax/ibicigY/microsoft_publisher_2010_brochure_templates_free.pdfIn PDF document text
    • https://xuxurebero.weebly.com/uploads/1/3/4/6/134673100/dojosobe.pdfIn PDF document text
    • https://cdn.sqhk.co/fipuwemupe/bjd4pgh/benefits_of_reciting_surah_ash_shams.pdfIn PDF document text
    • https://zoxuzula.weebly.com/uploads/1/3/4/4/134489613/jesudafipumoses.pdfIn PDF document text
    • https://cdn.sqhk.co/dejumosemun/BPyhfWY/7628856767.pdfIn PDF document text
    • https://cdn.sqhk.co/wixexozesila/adiejhh/download_aplikasi_maps_of_clash_of_clans_2019.pdfIn PDF document text
    • https://jawuvufos.weebly.com/uploads/1/3/4/8/134856807/kanovesekonare_mitesuj_ziseredofesena_kupiwafarop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://737c154f-ca75-4484-807d-9d5c19d76377.filesusr.com/ugd/7e84b7_a35f16100ea747ab962a07145f92f3c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wopari/baila_morena_hector_y_tito.pdfIn PDF document text
    • https://s3.amazonaws.com/gulapore/adara_kathawa_awasan_song.pdfIn PDF document text
    • https://s3.amazonaws.com/lumixi/51929840419.pdfIn PDF document text
    • https://a3de454e-1598-42bb-a259-4eb69c42f179.filesusr.com/ugd/fb5067_e32ba6a1454a4bbe9799719fcec97899.pdf?index=trueIn PDF document text
    • https://d3919fa5-c020-464c-a773-72e456e10464.filesusr.com/ugd/29136f_b70181837bd2418bbdcf5371683532c7.pdf?index=trueIn PDF document text
    • https://d6a293f2-6876-493d-91b7-c13182b05023.filesusr.com/ugd/bcaa7e_b869fa08074d48fcbc5991c7e1beb3e7.pdf?index=trueIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_c29fb7c1ae984465a2a16f829650dcc4.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_080d44a761a640688c09f4cb2c1cfb3e.pdf?index=trueIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_9c49b6b3e38845db9c23c6c91e6b1f8c.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_off00010128.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10128 4924 bytes
SHA-256: 409c1ded00504d9b5de8d3c31da84319c7dc8aa345606da05b2de1b1fcc90d92
font_01_sfnt_off000111d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D2 10516 bytes
SHA-256: 886eeb4282db4959edc961d0843ee3063c3e7e2f7e8090963cab627735254b46