Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc11a95c54aad23c…

MALICIOUS

PDF

75.6 KB Created: 2021-02-27 05:07:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b72a30327852ef1af72be21e22710dc8 SHA-1: 53ced5d61d937dfc1e6fc5f0ac35b69bf88beb17 SHA-256: dc11a95c54aad23c0e3497616750e958609eafa7c596e10028e21f63cb44d5cd
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with a significant number of external links pointing to various domains. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest a phishing or malicious redirection attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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/award?keyword=navy+seal+trident+patch PDF link annotation
    • http://lezeninimi.medianewsonline.com/ethical_hacking_training_institute.pdfIn PDF document text
    • http://tendernes.ru/bartok_mikrokosmos_volume_2rez3n.pdfIn PDF document text
    • https://cdn.sqhk.co/fivukidado/h3QQeib/74862534767.pdfIn PDF document text
    • https://cdn.sqhk.co/reriwoduriju/GghZhia/box_braid_salon_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/raninogozo/dhejfii/vadakavunijori.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/mixosisal.pdfIn PDF document text
    • http://azakalaza5.xyz/vumoweromofelulefedagisi06ktk.pdfIn PDF document text
    • https://cdn.sqhk.co/setupemup/ew6jc6N/nogelevegetugereseborir.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/idv7Eji/mexoseduzilosusunosupug.pdfIn PDF document text
    • https://cdn.sqhk.co/janimivaxo/jgdRMNZ/blood_glory_mod_apk_2017.pdfIn PDF document text
    • https://gitujibexilen.weebly.com/uploads/1/3/1/4/131406430/3590308.pdfIn PDF document text
    • https://cdn.sqhk.co/rakapuvad/ewghjcV/vogadijokisexederoju.pdfIn PDF document text
    • https://motonikepo.weebly.com/uploads/1/3/0/7/130739202/vipuxazibeseru-dapaxus-wokemaj-nigon.pdfIn PDF document text
    • http://epipog.com/neato_botvac_d6_instructionsbkigt.pdfIn PDF document text
    • http://xilatotes.sportsontheweb.net/what_is_puerto_rican_food_called.pdfIn PDF document text
    • http://vvd.bar/harry_potter_and_half_blood_prince_full_movieiadr2.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/tom_and_jerry_drink_ingredientskwn3c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/gedesisumi/pinironej.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/formation_chaudronnerie_navale.pdfIn PDF document text
    • http://rosajeku.myartsonline.com/10354044083.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/cambridge_english_empower_a2_descargar.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_off0000ea83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA83 5292 bytes
SHA-256: 9cdf81fba88e0b3b8fad2adc8682107af3bd9281d630d73669061e378130a294
font_01_sfnt_off0000fc8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8F 10664 bytes
SHA-256: 93a5526a332b0038b0220678f2a79fb525c534909440d824714bdaae0cda9d27

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