Malicious PDF — malware analysis report

Static analysis result for SHA-256 eef23fc56a4259fb…

MALICIOUS

PDF

69.7 KB Created: 2021-03-04 02:58:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bc174c1a911fde47ca80b3e5f9f39edc SHA-1: b981f00cfe91398d3d7f54199c10111e37c97498 SHA-256: eef23fc56a4259fb409b5d0ca2b63d6c44f5c5420e096b5cd33bf9b35797ec05
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm or phishing lure, with the primary URL being `https://gimoguvi.ru/123?utm_term=xbox+360+wireless+adapter+f%25C3%25BCr+xbox+one+controller`. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is designed to redirect users to potentially harmful external sites.

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://gimoguvi.ru/123?utm_term=xbox+360+wireless+adapter+f%25C3%25BCr+xbox+one+controller
    • https://xevoniwibefi.weebly.com/uploads/1/3/5/9/135984774/8279693.pdf
    • https://cdn.sqhk.co/borefigux/h0jbPjd/beatevo_yg_mod_apk.pdf
    • http://gexopidikimo.mygamesonline.org/richland_township_zoning_ordinance.pdf
    • https://cdn.sqhk.co/kegufamop/2gcXiJ0/battlefield_4_commander_download_android.pdf
    • https://dopijixofovaje.weebly.com/uploads/1/3/4/6/134692352/a66707e51f432.pdf
    • https://cdn.sqhk.co/gujadozede/e2gfc2a/nuzudubivolavetapujusa.pdf
    • http://bukupiduge.mypressonline.com/how_much_does_a_union_pipefitter_make.pdf
    • https://kerumeso.weebly.com/uploads/1/3/4/6/134641164/vodazug.pdf
    • https://cdn.sqhk.co/datagemop/oghCja9/wd_my_cloud_app_android.pdf
    • https://cdn.sqhk.co/xamapetarel/dgfRhcs/13238064103.pdf
    • https://cdn.sqhk.co/giwitosak/hbjidig/nawowojurixemelavi.pdf
    • https://cdn.sqhk.co/zegofurop/cHxuiaf/milkshake_recipe_easy_pineapple.pdf
    • https://cdn.sqhk.co/wepurodapike/QhbvgjA/noob_vs_zombie_shooting_games_unblocked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fekaduvopigab/9547745613.pdf
    • http://gurabagoderes.atwebpages.com/is_vedic_astrology_more_accurate_reddit.pdf
    • https://s3.amazonaws.com/kubafezin/85991810181.pdf
    • http://wenibeliso.atwebpages.com/30003404901.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cdeb.bin
9d5f638396c5fcfdd0ef40cb7b7422cd6be8b5bbad34be6cd7dbc74b9e2a651d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDEB 6004 bytes
font_01_sfnt_off0000e247.bin
16201cb4a429832b2713431a52898642354939913e7436f495ca6bb5bd962245
pdf-font-stream PDF embedded font (sfnt) at offset 0xE247 10668 bytes