Malicious PDF — malware analysis report

Static analysis result for SHA-256 508a72d280225bcd…

MALICIOUS

PDF

75.1 KB Created: 2021-03-20 15:29:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 896494bd4aece4ebfa60bae448f7aa7e SHA-1: 1819ffb3282c0d6d0892f633cf4b2e00d2670d11 SHA-256: 508a72d280225bcdf212b6315325cdd05832865c7daa7389640c45fa23d1ee52
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://pelibifir.ru/123?utm_term=aeroporto+malpensa+numero+telefonico+per+informazioni PDF link annotation
    • http://xibiselid.medianewsonline.com/15851809158.pdfIn PDF document text
    • https://fusajowaxoxa.weebly.com/uploads/1/3/5/3/135344195/a7af5bd837e3ab9.pdfIn PDF document text
    • http://minosijasif.mypressonline.com/lavizewuzoruvow.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/fxnCmCb/star_wars_kotor_2_mobile.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/gibezhe/mutizipexuxowolapege.pdfIn PDF document text
    • https://cdn.sqhk.co/sitopizol/hhdhb3Y/ping_pong_games_to_play.pdfIn PDF document text
    • https://zuvofuguwapu.weebly.com/uploads/1/3/4/0/134042474/mujojip_nebekevapopa.pdfIn PDF document text
    • https://cdn.sqhk.co/bemememu/9hdLCFm/disney_pin_scanner.pdfIn PDF document text
    • https://fimuvuxufubewi.weebly.com/uploads/1/3/4/4/134442536/47940.pdfIn PDF document text
    • https://verijijul.weebly.com/uploads/1/3/4/8/134861220/leninefo_gewij_tikosuluneboj_gozoragiloz.pdfIn PDF document text
    • https://cdn.sqhk.co/wugeguxu/jhhgkYb/toy_story_drop_scene_3_level_55.pdfIn PDF document text
    • https://pogedufofow.weebly.com/uploads/1/3/4/5/134512351/2a79a4.pdfIn PDF document text
    • https://lijowuvum.weebly.com/uploads/1/3/4/6/134624244/mewikimonu_kapalo_lesidenepuruxiv.pdfIn PDF document text
    • https://jojijuwewit.weebly.com/uploads/1/3/6/0/136057333/konejizejovanonixuku.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://retiziwo.myartsonline.com/fabeverexawumowevuzi.pdfIn PDF document text
    • https://7afd96e6-4611-46d4-9b98-d111b897c281.filesusr.com/ugd/154221_c90d4ccc13564513b0e3ff9fe1152cd3.pdf?index=trueIn PDF document text
    • http://lugenizuridaj.atwebpages.com/44107048807.pdfIn PDF document text
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_0795f492f22d42838591eb7cf5fadded.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_off0000e6a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A4 5200 bytes
SHA-256: f0ebf53eff0d0846f07c36f80164b74db61e8d5be9c19740d375e6cd131327ed
font_01_sfnt_off0000f846.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF846 11808 bytes
SHA-256: fa2299de73f702fb478f667407d18ed0f00215dd6e6754153ec19f5e3216d71c

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