Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4cd3e43cd7abe28…

MALICIOUS

PDF

78.0 KB Created: 2021-03-08 21:02:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 92e0f079d07cc961b6f56fbcf039dd5f SHA-1: ec941b3d77dcc230c09475b26f90f556684aa38d SHA-256: d4cd3e43cd7abe284d23d97b404f76ab5140a6bae55d9e5c1b891734d8592da2
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a phishing or link farm attack. It contains numerous external links, with a critical heuristic specifically flagging it as a 'PDF_SEO_LINK_FARM'. The document body, though heavily obfuscated, appears to contain SEO-related keywords, further supporting the link farm hypothesis. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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=osrs+the+corsair+curse+quest+guide+runehq
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/mifepodasejeke.pdf
    • https://cdn.sqhk.co/gutifusuf/gN0DWgj/minecraft_zombie_apocalypse_mod_1._7_10_forge.pdf
    • https://cdn.sqhk.co/xovujiroveg/dijjhjA/57070102727.pdf
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/dbd7443a.pdf
    • https://zedowami.weebly.com/uploads/1/3/1/6/131637063/2070370c4377c.pdf
    • https://bikujezojodu.weebly.com/uploads/1/3/4/5/134587809/8615892.pdf
    • https://tisogile.weebly.com/uploads/1/3/4/7/134728595/zavew_nifodonelaxexen.pdf
    • https://fisikovomit.weebly.com/uploads/1/3/4/6/134652659/fonejopisijon.pdf
    • https://gisipunav.weebly.com/uploads/1/3/1/6/131636927/3ef42f518064cec.pdf
    • https://cdn.sqhk.co/jivonotiso/gP6Bggy/apowersoft_screen_recorder_pro_review.pdf
    • https://cdn.sqhk.co/mezomabesoki/iAghnge/54445515051.pdf
    • https://cdn.sqhk.co/rapovebakeb/jakMTid/99822217533.pdf
    • https://cdn.sqhk.co/modonasuje/ijhhdaZ/speed_motorsports_finch.pdf
    • https://cdn.sqhk.co/mivivezar/jcggifR/most_difficult_puzzle_games_pc.pdf
    • https://wojamoze.weebly.com/uploads/1/3/4/4/134479738/lapolatemavofa.pdf
    • https://cdn.sqhk.co/kevapaboxer/fPiajYz/minecraft_mod_installer_pro.pdf
    • https://jubipolofolexi.weebly.com/uploads/1/3/2/3/132302872/boxixikuzozer_ligave_gulikapom.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/39c22698-eca1-47b6-9f6f-ab98e8bf9ef9/60029387763.pdf
    • https://uploads.strikinglycdn.com/files/f4a28e89-3d12-4a85-be30-c63a9079bd4b/lofthouse_whitewash_brick_effect_tiles.pdf
    • https://uploads.strikinglycdn.com/files/4887adcc-8f8d-497d-8e85-38f00384e151/fizomobavitipilopid.pdf
    • https://uploads.strikinglycdn.com/files/4ed9d27e-388b-4d60-9ab0-a12d62162b9b/best_self_help_books_for_mental.pdf
    • https://uploads.strikinglycdn.com/files/c9cdd7c2-69a5-47f4-a116-babbbb2089ba/56430581207.pdf
    • https://uploads.strikinglycdn.com/files/1e1260c7-44f9-434b-8c5a-69ae305fab18/88467343147.pdf
    • https://uploads.strikinglycdn.com/files/a6d48789-a63e-48ec-9516-914ea015ff3a/how_to_descale_cuisinart_ss-10.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_off0000e80f.bin
f5bbf7141298e9e0ae653a3e8adb0d382d4d48c26faabfe9232441532e651d3a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE80F 5324 bytes
font_01_sfnt_off0000fa12.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 3720 bytes
font_02_sfnt_off00010575.bin
0fffada34153ea5306271b8bf1d0ff92a2b2923be08e1aa013d0ed244d976262
pdf-font-stream PDF embedded font (sfnt) at offset 0x10575 10756 bytes