Malicious PDF — malware analysis report

Static analysis result for SHA-256 7618825e4e1e87e5…

MALICIOUS

PDF

83.6 KB Created: 2021-03-14 12:07:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c382b2f19ba847e946c0c3d87008b1a SHA-1: 141715a831ab0e5f593a5db6a9a193f77bed83d3 SHA-256: 7618825e4e1e87e5841954cc77e8bae07a2cd6af86c030da7cf8dc02da9e470d
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, indicative of a link farm or phishing campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://nipisod.ru/strik?utm_term=introduction+to+database+management+systems+pdf
    • https://cdn.sqhk.co/zujubokave/hjicjdn/lifetime_swing_sets_costco.pdf
    • https://nobuzuza.weebly.com/uploads/1/3/4/7/134757083/zupovutigu.pdf
    • http://soldonlakewood.com/schlage_electronic_lock_reviewsg2xo4.pdf
    • http://axecheat6.xyz/161339419431tksr.pdf
    • https://cdn.sqhk.co/pelopuxi/sgeq4he/tech_geek_store.pdf
    • http://jopuvalipi.22web.org/biology_book_free_class_12.pdf
    • https://romenugerod.weebly.com/uploads/1/3/5/3/135317494/5971285.pdf
    • https://cdn.sqhk.co/raxinosi/geggrm1/genasuzedovejisesutare.pdf
    • https://cdn.sqhk.co/dolafita/LgiP6aR/57759763356.pdf
    • https://poxemolefefax.weebly.com/uploads/1/3/1/4/131407365/1273763.pdf
    • https://talunijepi.weebly.com/uploads/1/3/4/5/134599753/30364.pdf
    • https://cdn.sqhk.co/xenudipu/c2hb9mo/53306233250.pdf
    • https://mekumago.weebly.com/uploads/1/3/5/9/135981587/78f8a0e.pdf
    • http://timogefubor.22web.org/32646127594.pdf
    • https://cdn.sqhk.co/metexemoraga/cPLhhjg/starbeam_runner_adventures.pdf
    • https://rajizoru.weebly.com/uploads/1/3/1/8/131856770/672ecc.pdf
    • https://cdn.sqhk.co/saturarad/hajdRgh/christina_perri_human_song_free.pdf
    • http://tehnotop.space/accu-chek_compact_plus_diabetes_monitoring_kitsoecw.pdf
    • https://pazivumamitobe.weebly.com/uploads/1/3/0/7/130739218/2378073.pdf
    • https://sesuwulot.weebly.com/uploads/1/3/1/4/131438847/4c998c6.pdf
    • http://whalesqpa.fun/78525440689cz2b6.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://pukifuxunejup.epizy.com/maintenance_costs_and_life_cycle_cost_analysis.pdf
    • http://junulanomelab.rf.gd/aqa_biology_a_level_revision_guide.pdf
    • 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc23.bin
0494f91621c5cdb4869e75013d8550728cfcefe8fab86185c8858b0c4e8bd9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC23 5504 bytes
font_01_sfnt_off00010ec0.bin
0f0161bb87934a0c39eea893b48e3ec22913137251a33644d4ad5eb095141c1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC0 10408 bytes
font_02_sfnt_off00013266.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13266 4324 bytes

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