Malicious PDF — malware analysis report

Static analysis result for SHA-256 379c7714c438855b…

MALICIOUS

PDF

77.0 KB Created: 2021-03-07 06:43:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 166f29d9d6f10da130e89f4d2d4bfa96 SHA-1: 5bfe7ae99699a97962128edc688c9bd6a0c36581 SHA-256: 379c7714c438855b190711ee844ab6b8f59d2a733c0327ccd03d2dd3d3ad4596
164 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 likely part of a link farm designed to obscure the true malicious destination. One of the primary URLs points to a domain associated with phishing and malware distribution. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links, likely for SEO manipulation or to host multiple malicious payloads. The ML classifier and ClamAV detection strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=narasimha+karumanchi+books+free+download
    • https://cdn-cms.f-static.net/uploads/4388052/normal_5fdc211f864d2.pdf
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5fd235d9e4150.pdf
    • https://juvezunadu.weebly.com/uploads/1/3/5/3/135306862/jorajupexek-zepoxo-vasanakud-rasunosuvujibi.pdf
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/9f97f2121299d9.pdf
    • https://fizokufewof.weebly.com/uploads/1/3/4/0/134096090/telozo-foted-defiwu-dazisezuduvu.pdf
    • http://jixewelo.scienceontheweb.net/xejunikefosumidux.pdf
    • http://pobunav.sportsontheweb.net/loloxot.pdf
    • https://cdn-cms.f-static.net/uploads/4501212/normal_602ad1524fa55.pdf
    • http://pedaxofanor.mywebcommunity.org/wd_tv_live_remote_control.pdf
    • http://xidufefonudug.sportsontheweb.net/wapevipedexazel.pdf
    • https://xigefazevape.weebly.com/uploads/1/3/4/6/134632801/tutoxibusunolosozi.pdf
    • https://baveretam.weebly.com/uploads/1/3/5/3/135314503/nisak.pdf
    • https://nikakakuko.weebly.com/uploads/1/3/1/8/131871571/772759.pdf
    • https://didunoduwogu.weebly.com/uploads/1/3/2/6/132682107/toxime.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bd647fae-843f-4c28-b865-bdf2dc3d6c42/74365375282.pdf
    • https://uploads.strikinglycdn.com/files/b62fd23a-ad00-4221-80fb-455f4726e02c/is_darth_bane_the_most_powerful_sith.pdf
    • https://s3.amazonaws.com/nawuvud/bolne_wali_cat_ka_game.pdf
    • https://uploads.strikinglycdn.com/files/b63fa347-cb51-44f5-96eb-24fe71ff73a9/brother_xr9500prw_sewing_machine_price.pdf
    • https://s3.amazonaws.com/rupatojuko/23080203911.pdf
    • https://uploads.strikinglycdn.com/files/fcd305cb-d5a0-4215-a060-33a585ae4e81/ropekezeguronazelo.pdf
    • https://s3.amazonaws.com/dazemi/jeteravifawibupum.pdf
    • https://uploads.strikinglycdn.com/files/832baf26-e4b0-49fc-85be-fa459f4194b4/xanalixete.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://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e328.bin
a3efd8a300b793bfb2247f0b08e11e1dd567581e2005e24ede060970ec7c40d2
pdf-font-stream PDF embedded font (sfnt) at offset 0xE328 5528 bytes
font_01_sfnt_off0000f5d9.bin
6539b129c5cd894636dc8f40f53a156c00c8f46378ab4f137c96d687a1cff6ed
pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D9 3720 bytes
font_02_sfnt_off0001013c.bin
992b3988097312de209c3f2c08c6758cf701b3b386dc4986104c30be765448c8
pdf-font-stream PDF embedded font (sfnt) at offset 0x1013C 10868 bytes