Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8127dfa1bfef5c8…

MALICIOUS

PDF

70.9 KB Created: 2021-03-31 01:29:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c747a3ceb6a6dd56f64b87e4f6b23b2 SHA-1: d3a7003c7c4365403fd47a9421eb92a779f2ea52 SHA-256: b8127dfa1bfef5c8c59ad1aef7f36df89df28bf8befd46ebe816fe57b9be2da5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, with one prominent URL leading to a domain associated with phishing and SEO link farming. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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/wix?keyword=white+pages+boca+raton+fl
    • http://blekrossi.ru/42771773961amwmr.pdf
    • http://hookup756.fun/136504088aex0s.pdf
    • http://nujijaj.getenjoyment.net/synthesis_of_benzanilide_from_aniline.pdf
    • http://nosinoski.shop/sofewumezagadelipijugs08g.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/midipes/19819129004.pdf
    • https://a49aa754-465e-4bbd-924e-b3d0e7b66bd4.filesusr.com/ugd/81d6a4_5bbe5d9f40c54c8cacdfb2bf065f984d.pdf?index=true
    • https://s3.amazonaws.com/jezobasit/49948681537.pdf
    • https://uploads.strikinglycdn.com/files/251776cc-b1a3-4093-80b0-198f869ba045/zuvadaxukesurifodutimi.pdf
    • https://uploads.strikinglycdn.com/files/ae99747a-265a-475b-928c-751831ee1829/you_raise_me_up_piano_and_violin_duet_sheet_music.pdf
    • https://s3.amazonaws.com/wekibik/sijenisemoxupajiterave.pdf
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_2f1a00a7aaf149e7ac9d0ac8821cce7e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2a9aada6-aee4-49ad-82c9-b6442a30bb63/what_percentage_of_social_workers_are_female.pdf
    • https://dda5c79a-a75d-44d9-a006-48dec3bfe172.filesusr.com/ugd/115d6e_0234a4b1e21349e7abe2c81ea9e8af49.pdf?index=true
    • https://uploads.strikinglycdn.com/files/f09de51b-b48c-419f-9bbc-f5b25af4b055/anthony_de_mello_awareness_audible.pdf
    • http://mifojizu.myartsonline.com/gulupoga.pdf
    • https://s3.amazonaws.com/timeziso/tepogu.pdf
    • https://s3.amazonaws.com/wozowuledij/taiwanese_passport_renewal_form.pdf
    • https://s3.amazonaws.com/votubukaxogilix/rodapofuzefixebo.pdf
    • https://s3.amazonaws.com/vukusa/popudidapaxokufok.pdf
    • https://s3.amazonaws.com/pipaneku/49844093728.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7e4.bin
428ae97203060225dbf76ac28d6693fac53294a81a76acabd0427c1fb78d891f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7E4 5432 bytes
font_01_sfnt_off0000ea66.bin
ac0d452aadf1eef45ebaf1159e2f090ac371f1dbaad789c5a6284b84751832e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA66 10588 bytes

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