Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ba41a7aa581c42e…

MALICIOUS

PDF

79.8 KB Created: 2021-03-18 07:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cea34c04e8d0858180ad03ff77b2b132 SHA-1: ceac71ced5c237d0fc2807d9525b0c2b96efd057 SHA-256: 5ba41a7aa581c42e1d173cf011e0bf54f7c77f3990f23368a85a7ee236c5c3d8
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 pointing to PDF files hosted on various domains, indicating a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of malicious activity.

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://vilenefex.ru/123?utm_term=cube+cube+roots+worksheet+class+8
    • https://cdn.sqhk.co/ruradavi/jXigNhj/pokijekozoboxefepig.pdf
    • https://niguzagum.weebly.com/uploads/1/3/5/3/135390192/moxetere.pdf
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/fanufijuzewa.pdf
    • https://cdn.sqhk.co/vizakifito/Hhfgggi/72062805532.pdf
    • https://dipupobelazaw.weebly.com/uploads/1/3/1/3/131380354/7709604.pdf
    • http://nopotaz.medianewsonline.com/disodefexafali.pdf
    • https://vonulimuwudepaf.weebly.com/uploads/1/3/4/1/134131723/vikevawi.pdf
    • https://cdn.sqhk.co/tubafejog/hbagjRM/go_programming_language_cheat_sheet.pdf
    • https://rejasujewefem.weebly.com/uploads/1/3/0/7/130738882/tukegavaro.pdf
    • https://cdn.sqhk.co/rorefevobo/fvSuchf/3195585776.pdf
    • http://kudusakepupa.sportsontheweb.net/32308031205.pdf
    • http://ferobuxanax.iblogger.org/zudewewikevepegitigap.pdf
    • http://ligalirulal.22web.org/honda_generator_2000i_parts.pdf
    • http://mesanezedid.mypressonline.com/xomukimoluxivonubirule.pdf
    • http://sowopezamiw.medianewsonline.com/25533556990.pdf
    • https://lomamunapud.weebly.com/uploads/1/3/5/3/135315780/gesawunuwirebuz-pimef-sapifinaligifax-dodupuwupefax.pdf
    • https://cdn.sqhk.co/jirudumom/jTutgcx/67734552191.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://namezenidel.onlinewebshop.net/xipodosakubabeveda.pdf
    • http://wukefomirufiza.rf.gd/chamberlain_garage_door_opener_manual_myq.pdf
    • http://patigol.rf.gd/i_am_that_i_am_kjv_commentary.pdf
    • http://junusesofuxog.rf.gd/arabian_nights_hookah_lounge_milwaukee_milwaukee_wi_53220.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_off0000e33a.bin
15b2f86c6ace2b844334f3550e9eaa63dff29db7bd6662abdc617ee280801649		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 5280 bytes
font_01_sfnt_off0000f536.bin
d18d571990075bcc30a2bf18f3d2d93241bd3f329e771be723819c5069e19031		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF536 11228 bytes
font_02_sfnt_off00011bd2.bin
541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD2 16204 bytes

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