Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd76a811aed6561…

MALICIOUS

PDF

83.1 KB Created: 2021-03-28 19:03:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 114fe3161f893f3ffcde7e9f7218f5a4 SHA-1: 8311eec31008e8450597d0dca83ed7973e122370 SHA-256: 6fd76a811aed6561f39804a4e4108c9c633678a2481035b420ad1485f166abd9
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for Pdf.Phishing.Trojan and an ML classifier indicating maliciousness. It contains a large number of external links, many of which are hosted on dynamic DNS services and appear to be part of a link farm designed to distribute malicious content. The document body, though heavily obfuscated, contains references to movie titles, suggesting a lure to entice users to click on the embedded malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/wix?keyword=frozen+full+movie+online+free+dailymotion
    • http://zomolejefej.mywebcommunity.org/enzyme_catalyzed_reaction.pdf
    • http://gowanenutik.mypressonline.com/watch_la_la_land_online_free_dailymotion.pdf
    • https://sowofodifidem.weebly.com/uploads/1/3/1/8/131856479/7f97f3b1baf.pdf
    • https://pukogapuwobar.weebly.com/uploads/1/3/4/3/134307851/safid.pdf
    • https://siluxukazikuwo.weebly.com/uploads/1/3/5/3/135326211/bojapelari_gedepunaginarom_wikixumep.pdf
    • https://lufuwoxataj.weebly.com/uploads/1/3/1/3/131379696/fewarazato.pdf
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/kesuzuzuwozekisipem.pdf
    • https://nowiwadigomu.weebly.com/uploads/1/3/4/0/134018048/piropadotixe.pdf
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/508c980d4.pdf
    • http://gufurebu.medianewsonline.com/ridgid_10_miter_saw_r4112.pdf
    • http://nafewid.sportsontheweb.net/chevening_essays.pdf
    • https://vixagudidiw.weebly.com/uploads/1/3/0/7/130775505/susigitujiju.pdf
    • http://mojofaza.mypressonline.com/how_to_play_family_feud_game.pdf
    • https://widuboxizivibib.weebly.com/uploads/1/3/4/3/134315701/timadegutiv.pdf
    • https://fujuzelos.weebly.com/uploads/1/3/1/3/131380065/gawoni_dejuga.pdf
    • https://dazuneluxenewag.weebly.com/uploads/1/3/4/3/134316856/sopusuzigo.pdf
    • https://sokarapojuler.weebly.com/uploads/1/3/1/1/131163736/pefasafuvugibexitunu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1423d76f-a56f-4481-bf87-726e17039346.filesusr.com/ugd/14aee2_e102e39b879142f98c1e059ec2d8bb61.pdf?index=true
    • https://8ee4d174-735f-4cd7-9396-c3a65dbcc337.filesusr.com/ugd/5ac313_9bf4f18a85b74ba2b3dcb03adc4e2ae1.pdf?index=true
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_02afc961adb84a2fb3cb6762d86f6a44.pdf?index=true
    • 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_off000107ad.bin
d1847a76b1a61bfc65054c68798845cc343757522936fa77786c2e715e52f23d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107AD 5040 bytes
font_01_sfnt_off000118d6.bin
103187e736181e8f0cf9c33266efb6bb0b1ec1a44ffafc632d5f9b36e854015d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118D6 11316 bytes

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