Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03f637f445cd38c…

MALICIOUS

PDF

114.6 KB Created: 2021-03-31 08:10:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0e2cb7c05fa3ef1566f18756df2e483b SHA-1: d559721d1aa1afd58ae3b206b45365e4b3fac0ff SHA-256: a03f637f445cd38cd1acab4cb6b850c8d06c673b01900d63a685e499e51866f6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, many of which are dynamically generated or hosted on suspicious domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. The document body, though obfuscated, contains keywords related to books and downloads, aligning with the lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://golowaki.ru/award?keyword=blog+de+libros+romanticos+para+descargar+pdf
    • https://cdn.sqhk.co/tupizurelir/hifWggy/gugiku.pdf
    • http://dixagodal.iblogger.org/midafuguludatazefa.pdf
    • https://cdn.sqhk.co/jemedolena/cwCgcij/effective_advertising_techniques.pdf
    • https://goxatuzibifonev.weebly.com/uploads/1/3/0/7/130739188/vojadizotupuram.pdf
    • http://insurancecarusa.com/mupurijesefavunivbl1bq.pdf
    • https://cdn.sqhk.co/gasidonoda/5ofhjuL/83125761570.pdf
    • https://cdn.sqhk.co/wojipezusax/MifARhg/romantic_italian_songs_with_english_subtitles.pdf
    • http://ubsvp.com/college_football_game_score_predictions_bleacher_reporthgfbe.pdf
    • http://xoziduso.mypressonline.com/16828427351.pdf
    • https://raxagipob.weebly.com/uploads/1/3/4/8/134883443/setusokuzaku-tupegizajazo-zekogozojomo.pdf
    • https://cdn.sqhk.co/dumotometapo/iQOLNhf/zitupofibo.pdf
    • http://jaxifas.getenjoyment.net/shell_rotella_t6_5w30.pdf
    • https://jufavufopu.weebly.com/uploads/1/3/4/3/134340263/povabosoba.pdf
    • http://jewlgems.com/dyson_cinetic_big_ball_animal_allergy_vacuum_for_saleg3oha.pdf
    • https://cdn.sqhk.co/loberutebe/9jdjfgq/slice_n_dice_wow_classic.pdf
    • https://cdn.sqhk.co/tavikalamo/j2YghjG/56239864135.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sodokeb.epizy.com/34499911378.pdf
    • http://loratozojakin.epizy.com/wawelomuwewugezujadam.pdf
    • http://xopabaw.epizy.com/pediatric_hypertension_guidelines_2020.pdf
    • http://moxapowi.myartsonline.com/lijukataboduselilapuwaf.pdf
    • http://palibam.atwebpages.com/9854776030.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00017e53.bin
7517e7e648d330ff7171256def887f6c4e8d5eecd677c2d6a911b5169a00d1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17E53 5664 bytes
font_01_sfnt_off0001917d.bin
c879df084e4dd6f73db27a68472c58c7547bf9886a2abd1b397b42041bde5e2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1917D 12648 bytes

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