Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0c5b7e8130d3313…

MALICIOUS

PDF

83.4 KB Created: 2021-04-09 04:50:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8a88290596c74e6e5eab03ca78243e9c SHA-1: a6f92e01e7602450ba3a6b0af34ccc5fe52df46a SHA-256: a0c5b7e8130d3313e646b3acadbbc43b0251cdcc9774f60ec375ab50dae6289f
186 Risk Score

Malware Insights

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

This PDF document is classified as malicious by ML and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, directing users to numerous external URLs, including a suspicious one at 'pelibifir.ru'. The document's content is heavily obfuscated, but the presence of external links and the ML classification strongly suggest it's designed to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=best+stock+trading+platform+australia+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383467/normal_5ff49baa43b0b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495843/normal_5fd63c966520e.pdfIn PDF document text
    • https://rikelakejif.weebly.com/uploads/1/3/4/8/134885243/d7c767fc2ff30da.pdfIn PDF document text
    • https://telidububiz.weebly.com/uploads/1/3/1/4/131452987/mojefetobof_wajuxa_bivijik.pdfIn PDF document text
    • https://famutogerene.weebly.com/uploads/1/3/4/6/134688643/xolanekuxexeje.pdfIn PDF document text
    • https://gareketekefebon.weebly.com/uploads/1/3/4/6/134695024/ebdb9d5a4a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453537/normal_5fc6ccea726c0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386335/normal_5fdd30c2c4c83.pdfIn PDF document text
    • https://vosanuxavuzom.weebly.com/uploads/1/3/6/0/136089669/7d0e2ce145ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411246/normal_604e1268b539c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5fdd60f12ce9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491153/normal_60282a2446c78.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403537/normal_5ff8bb00222de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_76d3a85dee9e4d528a1f35463cfef0a8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/woxorojero/fluval_206_filter_troubleshooting.pdfIn PDF document text
    • http://dasilumenuf.rf.gd/86492975344.pdfIn PDF document text
    • https://e31b828f-dd5d-4b35-abba-5777d5fc2ed6.filesusr.com/ugd/56a8cc_ee27c00cfb5b4ddf96e4d85e913600ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tiduro/68100291518.pdfIn PDF document text
    • http://weferobiditikun.epizy.com/370111910.pdfIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_8dc5d3b5503441a7a42ec2a7eb3b9006.pdf?index=trueIn PDF document text
    • https://d73c234d-0e3d-497d-8108-d5659bace061.filesusr.com/ugd/58a813_fcd74ce6661a45c1953d645c0c7ec0ed.pdf?index=trueIn PDF document text
    • https://2e03c77f-99cc-4591-9807-54d8d49c9ce6.filesusr.com/ugd/759733_1df09a60877e454a9dce8d60a76db125.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 5472 bytes
SHA-256: 3dbc5e55253eb6f71dd00d83d5c477142517e130b35981c502c78e8903b9093f
font_01_sfnt_off00010cef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CEF 10920 bytes
SHA-256: c3d27074761538b14670fc94f2f76f574b9d8c3fd8a4b3072c24fd7747d78ed4
font_02_sfnt_off00013230.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13230 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2