Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2427e6ca4c6887…

MALICIOUS

PDF

73.6 KB Created: 2021-03-18 07:42:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 02075dee7b0ccbbedcfd4f766bf8bb3f SHA-1: 750b9567bd0dabc273dbb6162c9021579a631f44 SHA-256: 7c2427e6ca4c6887a45e06b1b4ae27ee3d3d7f4caeeaad4f8c02792cc4dee492
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one pointing to a suspicious domain 'vilenefex.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm for SEO manipulation or phishing. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/123?utm_term=consider+the+lilies+flute+sheet+music
    • https://cdn.sqhk.co/ginonunujiji/Dpic8ji/jaluwagixegivenekibur.pdf
    • https://cdn.sqhk.co/badaxiloru/caDicqX/furreal_friends_starlily_my_magical_unicorn_pet.pdf
    • https://cdn.sqhk.co/wepunajexiju/dShhjfm/online_cable_size_calculator_australia.pdf
    • https://cdn.sqhk.co/mosugukasiba/Y0M9iax/new_tik_tok_flute_music_ringtone_download.pdf
    • https://cdn.sqhk.co/riroxale/yJgjih3/25390974077.pdf
    • http://fontawesome.iohttp://fontawesome.io/license/
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bupijila/49676259934.pdf
    • https://s3.amazonaws.com/fonibinaraj/gerry_weber_international_ag_annual_report_2018.pdf
    • https://s3.amazonaws.com/limewub/phishing_email_awareness_template.pdf
    • https://s3.amazonaws.com/palevijuj/54661845946.pdf
    • https://s3.amazonaws.com/temujonuwu/39208593947.pdf
    • https://f0f855fd-29d2-4bf6-9fdd-af1de8d1f91d.filesusr.com/ugd/184831_f7f41c6a74194a95afd0072c27696b79.pdf?index=true
    • https://535a9070-e28a-464b-adc5-c02ad08be00b.filesusr.com/ugd/9df9d6_e99366e3361a43dd9e7f3e21a2421c7e.pdf?index=true
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_d085217ceee7432da1261622d6cbb99d.pdf?index=true
    • https://s3.amazonaws.com/vapite/23195467629.pdf
    • https://s3.amazonaws.com/remufuzu/samelumobokutukedopane.pdf
    • http://dufovufozotetan.epizy.com/app_store_for_ios_9.pdf
    • https://s3.amazonaws.com/saziwijaxodav/15282818915.pdf
    • http://titunika.rf.gd/31067831608.pdf
    • https://36fc1fe3-b646-4cc1-b6e9-de51469aea27.filesusr.com/ugd/3eb4bd_7d6718809eba4d73bc455c798b0fe552.pdf?index=true
    • https://s3.amazonaws.com/werowibovezoje/infectonator_2_special_zombies_guide.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_5c5b23be09e84167a2b20c0bfde0fbb6.pdf?index=true
    • http://noniwelabezona.rf.gd/mulapiwiluresuxaguxanag.pdf
    • https://64e18f06-8a0e-4dc1-8427-9dd81b4bff36.filesusr.com/ugd/baa514_0bbb43ec036542e3bf59b565ea52a5fe.pdf?index=true
    • http://kinamanerat.epizy.com/xat_2016_answer_key.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_off0000d82a.bin
3f970c45e1aacf9fc5a3f7f8715ea8552ab866e181089cb3f9e66f48da3a7345		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD82A 1584 bytes
font_01_sfnt_off0000e033.bin
99f2c00b5bd126b25b0d9f268e4bcc09d3619e7d43317fe0cdbc60bf1d57adee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE033 4956 bytes
font_02_sfnt_off0000f0e3.bin
5b939982954c8e298b9184fb561e0ee024b76d1c1b139cc74139ebb118316071		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 11068 bytes

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