Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d0245de935196df…

MALICIOUS

PDF

76.4 KB Created: 2021-03-18 15:03:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 33a193f400a6af8173131ded91d66fbe SHA-1: 6539a3e02521a2c4432c1cbe92c87eaa9670ed48 SHA-256: 3d0245de935196dfeef1546803045035324db7d3b796bddbab05aebe39801768
156 Risk Score

Malware Insights

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

The PDF contains a mass of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as Pdf.Phishing.Trojan. The presence of embedded URLs and the nature of the link farm suggest the primary goal is to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://crophysi.ru/wix?keyword=fixie+bike+gamestop
    • http://vsedlyatebya.xyz/pl_sql_tutorial_pointgb52p.pdf
    • https://tolawururajetam.weebly.com/uploads/1/3/4/8/134883146/667002.pdf
    • http://hurleyshamburgers.com/3620991716k256q.pdf
    • https://static.s123-cdn-static.com/uploads/4444115/normal_60002e8f5bb2c.pdf
    • https://rigonabex.weebly.com/uploads/1/3/1/4/131483185/38043cbcaa168f.pdf
    • https://cdn-cms.f-static.net/uploads/4380228/normal_600d971e798ee.pdf
    • https://sakofavore.weebly.com/uploads/1/3/3/9/133997309/tokoreligifug-gurulot.pdf
    • http://lunesygets.xyz/run_run_super_v_cartoonnzqi5.pdf
    • http://antileqphh.site/87883265237adveq.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pavujiniz/kekasanad.pdf
    • https://s3.amazonaws.com/benuka/dazoparizumar.pdf
    • https://s3.amazonaws.com/sagotomagin/what_is_another_word_for_not_aggressive.pdf
    • https://827a6da4-a69c-4806-aaaa-db522494bc4d.filesusr.com/ugd/cb5916_d14f70d91ae2497697fcb12e926ab9f9.pdf?index=true
    • https://s3.amazonaws.com/wekibik/permitted_development_guidelines.pdf
    • https://s3.amazonaws.com/subopukomanaw/alif_novel_episode_3_free.pdf
    • https://s3.amazonaws.com/davawina/bharat_movie_trailer_full_hd.pdf
    • https://855e1e5b-0daf-4dce-aa73-dfad2bfec5df.filesusr.com/ugd/ced2dc_d7b710acaa8e48a5b794d55187617519.pdf?index=true
    • https://s3.amazonaws.com/radubozufiwo/woserirujamamezizanakuz.pdf
    • https://3745348a-78a0-42d7-8ff4-af2b45bf5faf.filesusr.com/ugd/02631b_5738c8913e0448e29f119bce8ea85cc5.pdf?index=true
    • https://s3.amazonaws.com/donake/nenibesef.pdf
    • https://2065f6f1-29fb-48ac-a230-4f4ab2d4b746.filesusr.com/ugd/b62953_076be719f82e42f5988a3a053bfaff58.pdf?index=true
    • https://de74b992-0de1-402f-a2cc-438209b178b2.filesusr.com/ugd/2693ef_dcd097e2f1b24c8887c17b079c775832.pdf?index=true
    • 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_off0000ecb7.bin
5ccd80d0a2b7991e44fb860edea3d542ccd300c06dc386a1899067feb39c53f7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECB7 5240 bytes
font_01_sfnt_off0000fe86.bin
38a80588f83dc6d672d4ddb597df1d4d8ef83682480777394a64aac539403ab4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE86 10716 bytes

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