Malicious PDF — malware analysis report

Static analysis result for SHA-256 472cd65d6a349ca2…

MALICIOUS

PDF

75.9 KB Created: 2021-05-11 22:41:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8e5cce93d1ef84076447ad0b192e0bb SHA-1: d4287c19e27b1c009ec540a1544efb0791e43b05 SHA-256: 472cd65d6a349ca26531010f661833667e026a76cbb1c161daf49ac5749adf23
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of a quiz lure in the document body further supports a phishing or scamming intent. ClamAV detection and ML classification confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://seumenha.ru/strik?utm_term=what%2527s+your+dog+breed+quiz
    • http://batmbatm.ru/19379665814l15e7.pdf
    • https://cdn-cms.f-static.net/uploads/4379355/normal_602cda301cf6f.pdf
    • https://vobuzotoxat.weebly.com/uploads/1/3/4/7/134705481/nikisewilozido-kesurobixol.pdf
    • http://detirago.iblogger.org/abortion_opposing_viewpoints_book.pdf
    • https://cdn-cms.f-static.net/uploads/4373264/normal_6026d0a32823b.pdf
    • https://gosabotef.weebly.com/uploads/1/3/4/3/134332229/gorexexapomipa.pdf
    • http://epipog.com/76550898780tf1qk.pdf
    • http://spiritstudio.ru/451216114368drme.pdf
    • https://cdn.sqhk.co/zomulusiku/pji5jc4/beautiful_love_wallpaper_for_mobile_hd.pdf
    • https://cdn.sqhk.co/xemajuvinel/hgigIz5/arjun_reddy_trailer_song.pdf
    • https://pilolekolaf.weebly.com/uploads/1/3/4/6/134655903/zukefepetunavezis.pdf
    • http://vinnipoh.fun/hp_officejet_7110_wide_format_eprinter_specification8bbrw.pdf
    • https://feropozu.weebly.com/uploads/1/3/1/4/131454035/7213551.pdf
    • http://fullstacket.online/568576989234f4np.pdf
    • http://zasoremejoka.iblogger.org/42070788351.pdf
    • https://cdn-cms.f-static.net/uploads/4405197/normal_605158cbefb96.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://305aa2e3-e1d2-413d-aa2e-f1bb83d03ded.filesusr.com/ugd/92ee2b_bd4cb38a17624cedbbe8472b148c937c.pdf?index=true
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_e1c512da14cd4804851e1b92ee98de17.pdf?index=true
    • https://cee4a208-09ac-40e0-983f-4c2cc776acbe.filesusr.com/ugd/5ed537_9cb87acc672941c4828f8f5c23e9c2af.pdf?index=true
    • http://getidevip.epizy.com/bk_precision_8601_dc_electronic_load_manual.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_off0000eb84.bin
16a522f6df0bb176a105f5a0daa296527fed1b5d4885fd4c89498b1d28945d1e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB84 5520 bytes
font_01_sfnt_off0000fe58.bin
094d096107f022b4a9f54af972d39fb62ee4bbae7d69469d7f9843b1d89a6a80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE58 10728 bytes

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