Malicious PDF — malware analysis report

Static analysis result for SHA-256 899a8e6ee4f629b2…

MALICIOUS

PDF

76.1 KB Created: 2021-03-15 01:06:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce7f778aab84b5382e79b92c3cd1fdee SHA-1: 213fd6017ca4e816b68d374a432438191c83e9a6 SHA-256: 899a8e6ee4f629b2aa131b4f70ca5f1533ef64fb9bf4f6d8f0c81c7faf7931fc
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 to link farms, indicating a malicious intent to redirect users. The ClamAV detection and ML classifier strongly suggest this is a phishing or malware distribution document. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of techniques used to deliver malicious payloads or redirect to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=flyer+layout+template
    • http://nupesupo.mypressonline.com/ways_to_feel_better_after_overeating.pdf
    • https://cdn.sqhk.co/taxodisilif/dyggjcs/19937723917.pdf
    • https://cdn.sqhk.co/velujuvaxal/jGndfRU/pagozonov.pdf
    • https://cdn.sqhk.co/sileluzorupo/hgixvih/70535600442.pdf
    • https://cdn.sqhk.co/guwaloxipete/cigKLxR/free_italian_music_ringtones_download_for_android.pdf
    • http://gulibej.22web.org/81143867533.pdf
    • http://vitefivivetawo.iblogger.org/44611818706.pdf
    • https://cdn.sqhk.co/parepejapoki/ghI87ia/tejogomisesakepupuweb.pdf
    • https://cdn.sqhk.co/dasulujina/gcphhjb/teatv_hack_apk.pdf
    • https://cdn.sqhk.co/tuwodemo/hjLQjeQ/blue_birthday_balloons_gif.pdf
    • http://ruwakus.22web.org/86795933314.pdf
    • https://cdn.sqhk.co/feguzuvubut/djg0jSQ/sonnys_place_halloween.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wiwesokowam.epizy.com/bavejopor.pdf
    • http://tigabogoramor.rf.gd/bissell_readyclean_powerbrush_plus.pdf
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_54a8070474ad4c3da71ceae023c0d79c.pdf?index=true
    • http://jeparilusukopof.epizy.com/caracteristicas_del_estado_liberal.pdf
    • http://duvasupe.epizy.com/fadujovifuvulefavoves.pdf
    • http://tozibuxadotoba.epizy.com/nifewitujisuvomugadunot.pdf
    • http://lojabupabavize.onlinewebshop.net/77628743139.pdf
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_813b5b123bf9455990fc36b21b6fa523.pdf?index=true
    • http://pidejekakej.epizy.com/bivujiv.pdf
    • https://989eff4c-946f-4221-9817-1a8d60f2082d.filesusr.com/ugd/7edf14_f6909d47d20b46afac12a5f2049bc7b7.pdf?index=true
    • http://lanawelelumifen.rf.gd/56075038990.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d95d.bin
37b3b1249005dc05a58633d273d6620b8fbb5f4fd6d4564c3ac5e4e6f9e5b48d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD95D 4844 bytes
font_01_sfnt_off0000e9cc.bin
33b14b7559cb9867822a052baa302a33935301cca523de22baffc783b3a3ca42		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9CC 10800 bytes
font_02_sfnt_off00010e0c.bin
5bfda07072dd2e1b0df7f1680a75ba616774ec51e1a09c257f000ba239241e1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0C 16140 bytes

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