Malicious PDF — malware analysis report

Static analysis result for SHA-256 716fecd2a8b2a297…

MALICIOUS

PDF

71.9 KB Created: 2021-04-04 11:27:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8b3a37d361aca22b2417988a910d0e0e SHA-1: d338b4fdf53ca771346c6339097a9a539882814d SHA-256: 716fecd2a8b2a2978781771d1c89a2c1a5e3ac29617570e1bcf72d350cc63a39
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed and point to PDF files, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=jobs+at+our+lady+of+the+lake+hospital+baton+rouge+la
    • http://limaxinsto.xyz/smith_and_wesson_915_grips_for_salez6kow.pdf
    • https://cdn.sqhk.co/jifigetuxu/cQIKeih/650454301.pdf
    • http://verezitabel.66ghz.com/nufadidida.pdf
    • https://cdn.sqhk.co/bilejufikone/iaWRhiq/hades_star_planet_upgrade_order.pdf
    • http://reweder.site/can_anyone_join_the_knights_templarkbknc.pdf
    • http://cardio-natural.info/46re_reman_transmissioneo6yx.pdf
    • http://agencymedia-ig.com/jufaxewevid6u5rt.pdf
    • http://lnstagram-helps-contact.com/70129558332ft5zr.pdf
    • https://cdn.sqhk.co/merabuvi/Thc1ijz/pew_pew_meme_sound.pdf
    • https://cdn.sqhk.co/jinubodilev/i3iftRb/nikah_mut_ah_in_pakistan.pdf
    • https://pedigujelod.weebly.com/uploads/1/3/4/0/134096449/1408822.pdf
    • http://aov.one/fenix_2.0_vaporizer_accessorieshffkz.pdf
    • https://cdn.sqhk.co/pakelabete/Zgjoigh/gavegawavo.pdf
    • http://hargotel.xyz/newimatag6ez7g.pdf
    • https://cdn.sqhk.co/xazururoxe/ijfie3q/wacom_inkspace_app_download_mac.pdf
    • http://legendnat.space/john_deere_4045_engine_torque_specsw304v.pdf
    • https://cdn.sqhk.co/norumuwapa/Lfijnia/border_patrol_checkpoints_phoenix_to_san_diego.pdf
    • https://viliwefat.weebly.com/uploads/1/3/1/0/131069961/65db1841052.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puzagivo.epizy.com/21545542637.pdf
    • http://vosafaw.rf.gd/android_studio_nexus_5_emulator_not_working.pdf
    • http://navebulaj.epizy.com/73292425772.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_off0000db26.bin
d03ae507185fba78e3f260976fd5bd2ab4334419bfae635c2e24f74101e4ef3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDB26 5600 bytes
font_01_sfnt_off0000ee27.bin
69e59dbdc94b444ca0e21671857338d0a335cb8532383398a825594dc62fd0d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE27 10580 bytes

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