Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1cb4cece2509d5…

MALICIOUS

PDF

77.1 KB Created: 2021-03-22 12:10:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3407eb28068afbf42c67b7d4d6af4c75 SHA-1: b931811dd3751d89cf468d039fd9bfb37cbc6d07 SHA-256: 1d1cb4cece2509d5aa39f58a2a2a5b07b47d39fb07d325ce1405591ea0bc2fff
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. The PDF contains a mass of external links, with one notable link pointing to `https://kuzutuzo.ru/strik?utm_term=fe+chemical+review+manual+2020`. The document body is heavily obfuscated, but the presence of numerous external links suggests an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://kuzutuzo.ru/strik?utm_term=fe+chemical+review+manual+2020
    • https://cdn.sqhk.co/tedubifo/biiejdQ/thoroughly_in_spanish_language.pdf
    • https://cdn.sqhk.co/ralajelisoju/2MRTgjx/33047393506.pdf
    • https://cdn.sqhk.co/rubutemoxe/jjhcfV0/mandala_coloring_pages_free.pdf
    • https://static.s123-cdn-static.com/uploads/4421472/normal_5fec503ac13b6.pdf
    • https://cdn-cms.f-static.net/uploads/4366304/normal_60543060ec74d.pdf
    • http://free-at.pro/nojomedpparv.pdf
    • http://custits.space/10257710457yssbz.pdf
    • http://zoomita.fun/pupiporalumumirifovotediys272.pdf
    • https://cdn.sqhk.co/furugilenu/jhjuev2/46402202776.pdf
    • https://static.s123-cdn-static.com/uploads/4450890/normal_5ff6c7981ba40.pdf
    • https://cdn.sqhk.co/kixagixupo/g93q4jb/tiles_hop_game_poki.pdf
    • https://cdn.sqhk.co/lamifiriluz/qTjegfZ/xupexezekelizopalole.pdf
    • https://cdn.sqhk.co/lanuniwa/hc81jaG/official_fall_date_2020.pdf
    • https://cdn-cms.f-static.net/uploads/4413696/normal_602825a217f3d.pdf
    • https://cdn.sqhk.co/virapazetif/jfsjjhg/kirudagimijetod.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ca6b24e6-01cd-4368-a310-1df05077a315.filesusr.com/ugd/11b39a_988271011b924e66ba558f72f27fae82.pdf?index=true
    • https://d787a32c-196b-4e99-9c98-3ae3c28023f9.filesusr.com/ugd/05b469_56562dc27ac64cff8bbd35d461984192.pdf?index=true
    • https://s3.amazonaws.com/wupuxus/ne_me_quitte_pas_lyrics_orion_sun.pdf
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_0461ce0a4b5742bcb9427b5e4322b6f8.pdf?index=true
    • https://4e4608fd-868e-43f5-b6ba-14e5e4b50785.filesusr.com/ugd/b1f235_b7b3b60df0cb41f489f2fe65863d13e3.pdf?index=true
    • https://8acf0fc4-2da8-4686-9788-d7840b5449fc.filesusr.com/ugd/fab691_1c2cd2e19b5d444ba1a87505f95c13c5.pdf?index=true
    • https://s3.amazonaws.com/sojenozap/cateye_quick_wireless_cycle_computer_amazon.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e090.bin
9dce45f2fc02a85d1a32713bb65a22f88e7a389fbf16d4185b9f0c2e92143f3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE090 4932 bytes
font_01_sfnt_off0000f12d.bin
46ec1ae8b3f81bc774f81e8c430887e3c21c9352b036340c1519e9a2b266aa59
pdf-font-stream PDF embedded font (sfnt) at offset 0xF12D 11704 bytes
font_02_sfnt_off000118f9.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0x118F9 4324 bytes