Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d15e33ed0e3d60…

MALICIOUS

PDF

70.7 KB Created: 2021-01-25 07:26:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: eaafa737442c7f26465a5729d85a0f9e SHA-1: 9a298093d0199ffd98816d0cf33c7b7078d39262 SHA-256: 43d15e33ed0e3d60dfef67c204764a78606248353b2f339f8db2f6051dc50009
126 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The presence of external URIs and the 'link farm' heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://leonvi.ru/123?utm_term=idaho+natural+resources PDF link annotation
    • https://cdn.sqhk.co/pigajifaw/aBGZhbM/jawudujiket.pdfIn PDF document text
    • http://eyebrowthreadingdallastx.com/vugepirinuvolafikikbfuef.pdfIn PDF document text
    • http://extrameets.fun/sovilmm1tv.pdfIn PDF document text
    • http://topshops.website/thruxton_classic_mod_apk6bi0s.pdfIn PDF document text
    • https://dojilosadokadog.weebly.com/uploads/1/3/4/8/134890500/2927331.pdfIn PDF document text
    • http://golden-bridge.pro/2507548589559ucy.pdfIn PDF document text
    • https://xekuvezenigut.weebly.com/uploads/1/3/5/3/135346982/5a460b4.pdfIn PDF document text
    • https://ropexosuwewi.weebly.com/uploads/1/3/1/3/131380205/visanomum_boxuluzupenidiz.pdfIn PDF document text
    • https://cdn.sqhk.co/limizolaxa/lgeihEr/find_friends_app_iphone_11.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zinudipir/asana_multiple_files.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/kogepefusedi.pdfIn PDF document text
    • https://s3.amazonaws.com/werowibovezoje/abirami_anthathi_in_tamil.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d7c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7C5 4964 bytes
SHA-256: 7f35f767c4122ed8cdd1feee68715783d8d19e34d80ab65f4ef8a28fb9db4e56
font_01_sfnt_off0000e89b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89B 10952 bytes
SHA-256: 5445bb10a526561950378aec6151d458099bfec3eb84f78b343cdcf7665d4986

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