Malicious PDF — malware analysis report

Static analysis result for SHA-256 14ceabe3f83e175c…

MALICIOUS

PDF

78.0 KB Created: 2021-03-31 14:21:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b45e1f69d605a3058a18c1c3317206aa SHA-1: 77297a4367fdeef6e2629161c1372a7577718c45 SHA-256: 14ceabe3f83e175c867a2dd6a309a4461446ac44f0f1182f926a31efbf95335a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, indicative of a link farm or SEO spam operation. ClamAV and ML heuristics flag this PDF as malicious, specifically as a phishing trojan. The embedded URLs and the heuristic findings suggest the primary goal is to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • 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://vilenefex.ru/123?utm_term=netbeans+8.+1+mac
    • http://3gusevshop.space/splatoon_inkling_makerizphp.pdf
    • http://punavuvipufov.sportsontheweb.net/limits_calculus_examples_and_solutions.pdf
    • https://lidanoliki.weebly.com/uploads/1/3/1/3/131380598/didox-noxetogu-rusigemiwus.pdf
    • https://babuzusevajuwo.weebly.com/uploads/1/3/4/8/134878483/bizorugap.pdf
    • https://vonepegoparopew.weebly.com/uploads/1/3/4/3/134352316/wozexijurop-dipikubekelo-suvuvifugese.pdf
    • http://fufirewavit.getenjoyment.net/76328377233.pdf
    • http://changepass.online/ukulele_strumming_patterns_4_4d4fg6.pdf
    • https://polovetanofup.weebly.com/uploads/1/3/5/3/135330247/8653331.pdf
    • https://kademagora.weebly.com/uploads/1/3/4/8/134850034/widiguturened.pdf
    • https://ganusanawopat.weebly.com/uploads/1/3/4/4/134488834/833049.pdf
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/20ec5.pdf
    • http://bluetea.space/best_free_html_landing_page_templates35fqr.pdf
    • http://podarokinsta24.online/21521113585h924y.pdf
    • http://kvyovk.xyz/norma_iso_4217jpins.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://1cd0d4d5-11d4-440c-a307-81f73801f601.filesusr.com/ugd/f0e51d_09a66206726645deb04eba086b1deb38.pdf?index=true
    • https://80172413-d145-4b71-b7cf-4a007d76ad29.filesusr.com/ugd/cacfd7_5427ce7a92cb4a5eb86525ac466c8ed5.pdf?index=true
    • https://cf4de027-7369-46c2-bf93-d69cabef2b5e.filesusr.com/ugd/868b90_c5721646b3f34ce089d9d09ef3f8d80d.pdf?index=true
    • http://kepofif.onlinewebshop.net/finite_element_analysis_for_civil_engineering.pdf
    • http://doxokalisawe.myartsonline.com/37937496894.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_off0000e63e.bin
bf839e15ae3c02f94d4d5777fdb64822dd6925b4f3a1644cf20d6b32a649af75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE63E 4836 bytes
font_01_sfnt_off0000f696.bin
6df42e81b608e00b5609ec4c24dd014d3ac6ce38668d02a72c3980b44a397a50		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF696 11652 bytes
font_02_sfnt_off00011c7d.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11C7D 4324 bytes

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