Malicious PDF — malware analysis report

Static analysis result for SHA-256 eed804244c33ce79…

MALICIOUS

PDF

78.6 KB Created: 2021-02-25 04:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: dcf5eead52c31d3f94acfad547656fcf SHA-1: d03997a7a21ab17e6a0563f048b0e2510608c701 SHA-256: eed804244c33ce79628f2691fea63cf66f902492ed5c9264b93b22a3d0c0acba
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to drive traffic to potentially malicious sites. The presence of a 'make money online' lure in the document body and the high ML classifier score further indicate a phishing or malware distribution attempt. ClamAV also detected this as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://baarspo.ru/strik?utm_term=make+money+online+paypal+no+surveys PDF link annotation
    • https://cdn.sqhk.co/puwukuwos/egj0ygi/herpes_simplex_2_rash_pictures.pdfIn PDF document text
    • https://dazuzidasepod.weebly.com/uploads/1/3/2/6/132681566/muxuxubozes_pukelusopamov_wililutafin_xerafapa.pdfIn PDF document text
    • https://cdn.sqhk.co/rinugezig/chcCUgh/cult_of_chucky_netflix_uk.pdfIn PDF document text
    • https://tasukivokojut.weebly.com/uploads/1/3/4/5/134592673/kerasudegewo.pdfIn PDF document text
    • https://wanovupejofo.weebly.com/uploads/1/3/4/5/134580977/gagowevaxuwelifut.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/kMhelii/velajuripe.pdfIn PDF document text
    • https://cdn.sqhk.co/sixitigoxeto/ehakhhi/multiplayer_racing_games_unblocked.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wugujub.onlinewebshop.net/what_is_lean_toyota_production_system.pdfIn PDF document text
    • http://doriponesarom.myartsonline.com/jizebonuwenizelarobix.pdfIn PDF document text
    • https://s3.amazonaws.com/niwotipugonuvoz/86812335330.pdfIn PDF document text
    • http://vubelifijam.atwebpages.com/motion_to_amend_probation_conditions.pdfIn PDF document text
    • https://s3.amazonaws.com/voxipanovigepiv/android_room_example_androidhive.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/vivaldi_spring_sheet_music.pdfIn 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_off0000f500.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF500 5196 bytes
SHA-256: e1fda832b903684313b5a391b109b216ce5853283e0f1de692dd98e0e34e0b02
font_01_sfnt_off000106ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AE 11260 bytes
SHA-256: a667994baa1ad54f6fbe6d789b6092aba308f0fa69b05d0e5e5dc36698f7249b

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