Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c38b500c09f8aef…

MALICIOUS

PDF

71.6 KB Created: 2021-02-12 06:32:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d32e06562272c296f9781a0bd33f7a01 SHA-1: 2b8e5011c10b2b8ea3f7187498e4cfac6fb29621 SHA-256: 5c38b500c09f8aef1fdf69e24297d0eb9509a61f380ce531f21aad1aaaaf2c4e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, characteristic of a link farm or phishing lure, directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect the user to a malicious site, possibly for credential harvesting or further payload delivery.

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wix?keyword=kenshi+how+to+mod+stats
    • https://static.s123-cdn-static.com/uploads/4480904/normal_600018b012e11.pdf
    • https://segukikiregitep.weebly.com/uploads/1/3/1/8/131856439/jizer-pewavefafifaj-wubosubupeb.pdf
    • https://natesikapepik.weebly.com/uploads/1/3/4/7/134750077/6450571.pdf
    • https://cdn-cms.f-static.net/uploads/4405467/normal_6024542f30dd3.pdf
    • https://cdn-cms.f-static.net/uploads/4412758/normal_601f667f7be0f.pdf
    • https://kesetemokeze.weebly.com/uploads/1/3/2/6/132682820/a02cd551.pdf
    • https://bodakipufasedoj.weebly.com/uploads/1/3/5/9/135972884/xulax.pdf
    • https://fejaxipanegis.weebly.com/uploads/1/3/2/7/132712099/f362d9.pdf
    • https://topudamix.weebly.com/uploads/1/3/4/5/134581811/beletak.pdf
    • https://zugufanebuloko.weebly.com/uploads/1/3/4/0/134016669/286839.pdf
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/lujasetuzaxotixirutu.pdf
    • https://wosuletoxo.weebly.com/uploads/1/3/0/7/130739711/376b98e.pdf
    • https://litirovedogamat.weebly.com/uploads/1/3/5/3/135393382/pafuti.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/pirofopafu/95060700806.pdf
    • https://s3.amazonaws.com/ladiwuzetawedi/miracle_worker_by_glowreeyah_braimah.pdf
    • https://s3.amazonaws.com/xezonijida/giduxafovoxazibubibotuze.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_off0000dd00.bin
38c35858ed4146e0e00a571cfe02602463e4f6f637cd28a39b365bd219e4a731
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD00 5000 bytes
font_01_sfnt_off0000edf3.bin
75609bee6ee6edac5da1c0cc577c0706da5c3d96ca41745e8abec7e342bade1c
pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF3 10504 bytes