Malicious PDF — malware analysis report

Static analysis result for SHA-256 981caf4edd3635f5…

MALICIOUS

PDF

79.4 KB Created: 2021-03-23 19:18:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b9b0e217ddd93895e76e8f13fb0b4567 SHA-1: 100f0855f6b5cecac23b8797d620a1fe705122e0 SHA-256: 981caf4edd3635f5f44cc6f03f5705da5773b3febe803995c41df4dd7412b07a
96 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. An external URI pointing to 'resalured.ru' was extracted, which is suspicious given the context of a phishing lure. The document body, though heavily obfuscated, contains keywords related to a product search, reinforcing the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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://resalured.ru/strik?utm_term=pentair+whisperflo+pump+leaking
    • https://cdn.sqhk.co/bigulikexupa/WyigIii/80553290271.pdf
    • http://digitalcalakk1.xyz/kovobuwilupizerox8470w.pdf
    • http://kumuzisixi.22web.org/29074569961.pdf
    • https://cdn.sqhk.co/ropobemuma/gWiaxjd/32891219017.pdf
    • https://cdn.sqhk.co/jilowepe/xjcibbg/grid_maker_for_instagram_pro_apk.pdf
    • http://persequen.com/tusunovubuxyztci.pdf
    • http://prolac.ru/allu_arjun_photos_naa_songswepsa.pdf
    • https://cdn.sqhk.co/xajamenujo/eges0ja/idle_tanks_3d.pdf
    • http://opssmall.space/nulepzze6x.pdf
    • https://cdn.sqhk.co/nudizodi/H2mhe51/the_art_of_war_2_betrayal_soundtrack.pdf
    • http://nubolutlion.xyz/how_to_start_my_own_online_magazinec11gu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/falevi/62890489292.pdf
    • http://vadarawofi.epizy.com/76114063171.pdf
    • http://gurapaf.epizy.com/42983445825.pdf
    • https://s3.amazonaws.com/jiwotarotavuz/tebivorikuz.pdf
    • https://s3.amazonaws.com/tinajabizoreguf/lullaby_of_birdland_bb.pdf
    • http://xadamodovupeniz.rf.gd/background_images_for_pc.pdf
    • http://tavopaku.rf.gd/letapidu.pdf
    • https://83d7d1d1-3661-4158-a2cc-78aa4aa39d08.filesusr.com/ugd/163759_9e9ff91dd122499ca5879c91df19d5c8.pdf?index=true
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_e6578f5ee8814aa0a1f9075aaea1fb75.pdf?index=true
    • https://s3.amazonaws.com/tarizirefevifab/the_structure_of_crystalline_solids.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_off0000eab7.bin
597f709e8ee98f14dfdd3cd92945c7773434e5d6a25448f924fdfcc50a2173ad
pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB7 5356 bytes
font_01_sfnt_off0000fccc.bin
223ffafdcb27d3cdd5459317da15fa17a8b91c5ba7911ef08c9aa63ffe79f980
pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCC 11036 bytes
font_02_sfnt_off00012273.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0x12273 4324 bytes