Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f5b770ec041181c…

MALICIOUS

PDF

73.5 KB Created: 2021-03-27 20:45:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db048bba9936b37ad2b210fe538e54ca SHA-1: 7c257214be6bb00a8061f76526966d71f072f055 SHA-256: 5f5b770ec041181c436b16fbfd98e7c29a1fdeefac9e67144f44c726b2d0bf90
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous external links, with one pointing to 'pelibifir.ru', suggesting a phishing or malware distribution attempt. The document body, though heavily corrupted, appears to be a lure related to educational materials, aligning with the 'PDF_SEO_LINK_FARM' heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/award?keyword=barron+s+essential+words+for+the+toefl+6th+edition+pdf
    • https://cdn-cms.f-static.net/uploads/4406456/normal_60282341a3d67.pdf
    • https://medowiwufaj.weebly.com/uploads/1/3/4/4/134480571/3d6c3799338.pdf
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd264adb295c.pdf
    • https://femovoba.weebly.com/uploads/1/3/0/7/130775826/84f0f8a.pdf
    • https://kuzapulekoxiror.weebly.com/uploads/1/3/2/6/132681507/5401124.pdf
    • https://dilaxizinis.weebly.com/uploads/1/3/5/9/135973905/povapidezofa.pdf
    • http://dashcamtopbest.com/laredifuqsnr.pdf
    • http://g2am2e.xyz/707909799776w7ny.pdf
    • https://raromimuzu.weebly.com/uploads/1/3/0/8/130874361/086124c214e.pdf
    • https://cdn-cms.f-static.net/uploads/4417212/normal_600fa994308cb.pdf
    • https://xigujevaw.weebly.com/uploads/1/3/4/7/134701692/436fc4.pdf
    • https://cdn-cms.f-static.net/uploads/4402252/normal_603060eb3e603.pdf
    • https://cdn-cms.f-static.net/uploads/4481834/normal_60593aca63ab1.pdf
    • https://sibotapitagota.weebly.com/uploads/1/3/4/3/134378411/bupobijibegan_xudazujonefe.pdf
    • https://xizidedatisaxos.weebly.com/uploads/1/3/2/3/132303240/4212859.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6c8ebe11-725c-420b-823a-68bc39d02ad2.filesusr.com/ugd/3e87bf_b71a8bebdb4649fabe944d1ffe381480.pdf?index=true
    • https://s3.amazonaws.com/tutapaxi/45848990124.pdf
    • https://0face946-3507-4f1d-9804-30df5ac990e4.filesusr.com/ugd/8dfcc1_8aa32235855a4cf7bc95066847dcd9e2.pdf?index=true
    • https://s3.amazonaws.com/luborinizu/how_to_program_a_avital_remote_starter.pdf
    • https://s3.amazonaws.com/sirilagewuga/tidivafonijipexu.pdf
    • https://s3.amazonaws.com/wavunot/selagafoperilaba.pdf
    • https://ca108e69-7b6b-43f0-8f16-d96ebeb8a33d.filesusr.com/ugd/79e0dc_1b3304cad9704386b596cb500c0e9258.pdf?index=true
    • https://s3.amazonaws.com/vebogotexaf/26777917582.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_off0000dae5.bin
a6402d0a18cf0b0221ad9c0143095c81c67b270c2530f3e2e96c35055f599b58		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE5 5424 bytes
font_01_sfnt_off0000ed63.bin
a4f4bf69da11280a8cf0ca5ca6224aeb045f75aa8c096befd72ff0675587ca08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED63 13296 bytes

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