Malicious PDF — malware analysis report

Static analysis result for SHA-256 b13470ace6968b04…

MALICIOUS

PDF

72.2 KB Created: 2021-02-21 05:20:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 6ef40589ce56f1efa362a612e32abbff SHA-1: 2257ac50136ba8074dd4af084446ea981f0c4a63 SHA-256: b13470ace6968b046f68c00dcab5f3e8fbb52ab272629f847fad50e970edbfbe
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, indicating it functions as a link farm. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggest this malicious intent. The presence of a URL like 'https://baarspo.ru/strik?utm_term=where+the+catalytic+converter+is+located' further supports the idea of redirecting users to potentially malicious content. ClamAV also detected this file as 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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=where+the+catalytic+converter+is+located PDF link annotation
    • https://cdn.sqhk.co/sebutarukaw/hghvJza/the_last_stand_2013_trailer.pdfIn PDF document text
    • https://rowigimafusapop.weebly.com/uploads/1/3/5/9/135982222/7954805.pdfIn PDF document text
    • https://vazagivire.weebly.com/uploads/1/3/4/8/134874695/3fccf553348fec5.pdfIn PDF document text
    • https://kefawefixak.weebly.com/uploads/1/3/0/7/130738991/zudeludegi_wikofivuxajat.pdfIn PDF document text
    • https://jedunifoxawixe.weebly.com/uploads/1/3/4/4/134458330/b62f91d3f2b6c.pdfIn PDF document text
    • https://nanoxoxudotu.weebly.com/uploads/1/3/0/8/130814682/mijefojofalofi.pdfIn PDF document text
    • https://gosibipidumoduj.weebly.com/uploads/1/3/4/3/134318513/882004.pdfIn PDF document text
    • https://cdn.sqhk.co/nolagutotato/RouIlif/17481506071.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/c291ifa/zutowoferew.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/6102857.pdfIn PDF document text
    • https://pawimugonuri.weebly.com/uploads/1/3/4/8/134882006/4148593.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefima/biiKjjf/helicopter_rides_las_vegas_groupon.pdfIn PDF document text
    • https://sefomaxezaniv.weebly.com/uploads/1/3/1/4/131483109/robobimux.pdfIn PDF document text
    • https://robavefozaxun.weebly.com/uploads/1/3/4/3/134379548/5067686.pdfIn PDF document text
    • http://bupomorefa.22web.org/adventure_games_list_android.pdfIn PDF document text
    • https://laregupofonel.weebly.com/uploads/1/3/4/4/134464195/furefukamu-guwavexo-gixorenemexo-nutiti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ruxududomaba.epizy.com/10_characteristics_of_good_information.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/game_brother_in_arms_apk_data.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/diuretic_drugs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/87508388885.pdfIn PDF document text
    • http://wanabovemuzume.rf.gd/valmiki_movie_audio_songs_telugu.pdfIn PDF document text
    • http://fugedofa.epizy.com/fitila.pdfIn PDF document text
    • http://dosunadis.epizy.com/python_module_requests.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_off0000dcb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB8 5200 bytes
SHA-256: 8174313e5fd7269cda653972200265f7087bbefc10c9c309983398e45f71fb63
font_01_sfnt_off0000ee77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE77 10680 bytes
SHA-256: c972af69e1d3334168893d3114390a4cac3c99f1eae3dfa57ad388e48291cd02