Malicious PDF — malware analysis report

Static analysis result for SHA-256 78246199b8960230…

MALICIOUS

PDF

107.1 KB Created: 2021-02-22 03:57:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3f6c10046cc00354b1a3c5f3a8b79cbe SHA-1: 34bfea38b702c179e529c985708e6ce9ca6803bc SHA-256: 78246199b89602307f73999ad2f181de00beec5fcc35bbcb36c045a82e30a5a4
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and configured as a link farm, indicating a phishing or malware distribution attempt. Heuristics confirm the presence of malicious redirector links and a high ML classification score, strongly suggesting malicious intent. No scripts were extracted, but the primary attack vector appears to be the exploitation of user trust through deceptive links within the document.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=solution+manual+for+introduction+to+real+analysis+4th+edition+by+bartle+sherbert In PDF document text
    • https://cdn.sqhk.co/pobumepova/heha0gd/pekas.pdfIn PDF document text
    • http://world-wild-shop.com/bupusatulamawaj8xj5.pdfIn PDF document text
    • https://cdn.sqhk.co/rutesawir/Cgfhiif/seselofakewenoguxejade.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446038/normal_60107f3ec95df.pdfIn PDF document text
    • https://cdn.sqhk.co/baxotonad/jbgh7hh/feloletanufoso.pdfIn PDF document text
    • http://tugrull.com/43578974976jh7oc.pdfIn PDF document text
    • https://cdn.sqhk.co/fudikeraz/IGqa2ge/fobume.pdfIn PDF document text
    • https://cdn.sqhk.co/nonatedogo/G4caXib/dozosovo.pdfIn PDF document text
    • http://file-id.ru/58606814351w54do.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379844/normal_6005083370aea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465386/normal_601814d82a4fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419001/normal_5fda3e63ab727.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/jbTgiiR/dynamons_world_2_game_vui.pdfIn PDF document text
    • https://cdn.sqhk.co/golomamone/jcDjizQ/cop_beat_term.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415934/normal_60293186f1aed.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ggiNYgi/29328872325.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_5fe62e26b44e3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xepalufozakot.epizy.com/super_mario_odyssey_guide_book.pdfIn PDF document text
    • http://ximitexus.epizy.com/95681183528.pdfIn PDF document text
    • http://zumewozuzetarun.epizy.com/bagaxojenakopi.pdfIn PDF document text
    • http://sefakifag.epizy.com/65180402223.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014814.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14814 5696 bytes
SHA-256: d1886953a0065b88546aba4fe7aef65ff226c0db2e2b48e2feddc7122e0faf60
font_01_sfnt_off00015b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B55 12332 bytes
SHA-256: c1fee9de8c3217571fe29c99881e1db87666f439e8e9422b8ae342312c477b4d
font_02_sfnt_off000185a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x185A5 16848 bytes
SHA-256: af67851e7b53e194102279c1b3d794bc00c4b31c558472e3d93513fe22888e7f

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