Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dce011b6a19cd0e…

MALICIOUS

PDF

77.7 KB Created: 2021-05-17 13:04:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd674a2e590a565afe4b444f3c6b674d SHA-1: b3064d6f82e7b18a66d0ef02cffa9b1c8cd6bd31 SHA-256: 5dce011b6a19cd0ebb65a4034884f64b613ba087e8b7938ad3dd340a663f0828
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains numerous external links, forming a link farm, with a primary malicious URL pointing to a phishing or malware distribution site. The document body, though heavily obfuscated, appears to be a lure related to printer ink, disguised as a search result.

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://xezojetit.ru/strik?utm_term=what+kind+of+ink+for+hp+4500
    • http://derilezin.sportsontheweb.net/76625555573.pdf
    • http://vemazewikale.22web.org/tekunimusifixubezenunaru.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/vipinib/makalah_metabolisme_asam_amino.pdf
    • https://s3.amazonaws.com/tokafanawa/15179186243.pdf
    • https://s3.amazonaws.com/pogolo/is_masterclass_worth_it_quora.pdf
    • https://67536400-2f23-40e2-9d3a-36ae3f4dfb8c.filesusr.com/ugd/5312ea_c507ee4a91a847dcb6f5b6f16c8f27a5.pdf?index=true
    • https://cbb9655c-b60d-4095-8c1c-bb5f9a2903c5.filesusr.com/ugd/4dd980_3a4caf26dd0748fa915fcdc48263c22d.pdf?index=true
    • http://badubitoj.epizy.com/xosizudarizunefetefij.pdf
    • https://s3.amazonaws.com/kudufigunabi/wifisokidamofonubakowo.pdf
    • http://tisafedipedev.epizy.com/gigiwiwitanivizebugeso.pdf
    • http://talaxapu.epizy.com/migiwub.pdf
    • https://s3.amazonaws.com/gezetega/speaker_boost_volume_booster_apkpure.pdf
    • http://xudazefujigi.rf.gd/wijip.pdf
    • http://bilisedutave.myartsonline.com/bipekused.pdf
    • http://miganuvag.myartsonline.com/adjective_list_with_marathi_meaning.pdf
    • https://cb2d4818-2134-4ea5-ae57-1bc45cfc4292.filesusr.com/ugd/7e787c_3636612de71a47d3af5a8177a26168a2.pdf?index=true
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_3ee4d6e46b5b475bbc9048bb34c6a7b9.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_off0000eef1.bin
7f45748402dfa1c344ebfb501c7c8d6bbffc7e97b42d84d3ae69cf491675b904
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF1 5352 bytes
font_01_sfnt_off00010138.bin
558ea3bc151472aaad411b87dcb82433b17875db7fa08b05ec7d0b8d07209263
pdf-font-stream PDF embedded font (sfnt) at offset 0x10138 11440 bytes