Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9b3a43d7aff531f…

MALICIOUS

PDF

85.7 KB Created: 2021-03-16 08:26:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 38d1a8c9e9c4ed3811ea225010dc79e2 SHA-1: 94ab4957ee90eddfe543d38c24ebc1c9907397d3 SHA-256: d9b3a43d7aff531feb125d665430cd8719198dba182bfd6028fbf635349f8152
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including a prominent one to "mezovuduw.ru", suggesting a link farm or phishing attempt. ClamAV and ML classifiers strongly indicate maliciousness, specifically flagging it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mezovuduw.ru/wix?keyword=verykool+vortex+rs90+mobile
    • https://cdn-cms.f-static.net/uploads/4410015/normal_601c8702dbc68.pdf
    • https://cdn-cms.f-static.net/uploads/4374366/normal_602af19496f4e.pdf
    • http://pagujubemozakev.22web.org/97998595017.pdf
    • https://cdn-cms.f-static.net/uploads/4414696/normal_60301797325a6.pdf
    • https://cdn-cms.f-static.net/uploads/4451736/normal_600ecf75ef14e.pdf
    • https://static.s123-cdn-static.com/uploads/4389127/normal_5fcc49012c7a0.pdf
    • https://cdn-cms.f-static.net/uploads/4417118/normal_602471312502c.pdf
    • https://cdn-cms.f-static.net/uploads/4459470/normal_602b7f6ba3b21.pdf
    • https://cdn-cms.f-static.net/uploads/4409409/normal_603cc4b2cd534.pdf
    • https://static.s123-cdn-static.com/uploads/4470205/normal_5fe117e3d8eed.pdf
    • https://cdn-cms.f-static.net/uploads/4372982/normal_60497fbe4fa43.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/wegemebufojafak/free_gift_certificate_template_golf.pdf
    • https://s3.amazonaws.com/xedewofuretujo/mopaveledesen.pdf
    • https://s3.amazonaws.com/tufitijinexu/attack_on_titan_season_3_finale_song.pdf
    • https://s3.amazonaws.com/polexebuj/caller_name_ringtone_apps.pdf
    • https://s3.amazonaws.com/folexapurilowe/vomuxofal.pdf
    • http://xeravujowa.epizy.com/neo_geo_bomberman_free_pc.pdf
    • http://jonejarazom.rf.gd/durga_saptashati_in_english_free_download.pdf
    • https://72858ab8-d36f-4bc2-b208-e5ec56e76d01.filesusr.com/ugd/3a4e0e_9ac63ddcd4774520b6d542473fd4dfa8.pdf?index=true
    • https://s3.amazonaws.com/nilititonawafim/46471852256.pdf
    • https://1682489e-d94b-4f22-b6a6-c8ecb623ca2e.filesusr.com/ugd/5f226e_d2fa13bc5c32489dba2b46ce0eca8b53.pdf?index=true
    • http://sisejarozig.epizy.com/tezipi.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_off00011130.bin
7c69f0ffd4eb5565f7688369709a4f1f8847e15713a915d023caa8100cdb6bb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11130 5316 bytes
font_01_sfnt_off00012340.bin
bf2b6baa82526cea150dcbf1c901ad647f5cfdbac7d85447313e63ad0746ede3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 11100 bytes

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