Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4e830633c9cd09…

MALICIOUS

PDF

143.4 KB Created: 2021-03-31 18:32:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ce7e5c40dd277a35991ae115a2fdeae7 SHA-1: 2fea1caefd9c6a51ef52867134b2bcb3996e75f9 SHA-256: 6e4e830633c9cd0966b4064d36de5e39425c12e9ab7e63e168759bcf14d0ec28
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-themed, suggesting a link farm or phishing attempt. One prominent external URI, 'https://vilenefex.ru/wix?keyword=directions+to+mount+pleasant+texas', is likely a lure to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://vilenefex.ru/wix?keyword=directions+to+mount+pleasant+texas
    • https://cdn.sqhk.co/fimegasaz/jchhigd/t_i_the_sims_freeplay_hack_ios_2020.pdf
    • https://cdn.sqhk.co/kutagigixef/ggLjdgc/97150003617.pdf
    • https://static.s123-cdn-static.com/uploads/4480582/normal_60090e8dba64a.pdf
    • https://cdn.sqhk.co/pinofizulag/ivsphaJ/jubimuragukot.pdf
    • https://cdn-cms.f-static.net/uploads/4422385/normal_603944e8874bc.pdf
    • https://cdn.sqhk.co/malofavu/ja2idk8/70630395541.pdf
    • https://cdn-cms.f-static.net/uploads/4469623/normal_6046669254e2c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nitajosasa/wibiwo.pdf
    • https://s3.amazonaws.com/vabedafozo/pe_design_10_software_key_download.pdf
    • https://uploads.strikinglycdn.com/files/122c238c-08b0-49f9-8a8f-83b56e0a55fc/do_you_need_an_adapter_for_xbox_one_turtle_beaches.pdf
    • https://s3.amazonaws.com/sorogamat/amrita_virk_ke_gane.pdf
    • https://s3.amazonaws.com/forupokisip/cute_baby_boy_photos_hd.pdf
    • https://afa032df-bfad-47da-a9c8-c79260182993.filesusr.com/ugd/6f9b04_2da16f33b48b40ccaf3abf5c80bb02da.pdf?index=true
    • https://s3.amazonaws.com/kijelopazekune/gametogenesis_indonesia.pdf
    • https://b9ecad59-ee1c-469f-8402-ddbad3bf215f.filesusr.com/ugd/84dab8_937fb1c3feaa4360b8e1e8c67ea76f15.pdf?index=true
    • https://uploads.strikinglycdn.com/files/eff69481-7655-4644-83d3-82bf5583de49/traductor_italiano_espaol_gratis.pdf
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_82032d3948c6425d84a0a435f120eaf2.pdf?index=true
    • https://s3.amazonaws.com/lumixi/9235364922.pdf
    • https://s3.amazonaws.com/musokejixami/what_to_eat_for_a_healthy_lifestyle.pdf
    • https://6200e599-3f2f-4e3e-ab45-e6977ed7e777.filesusr.com/ugd/f8de3e_893b6cdcb7a14058948f93733c0713a0.pdf?index=true
    • https://s3.amazonaws.com/lodazojamuva/mejulusinu.pdf
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_9a49beee35a8414fb0e267bb5ae6557b.pdf?index=true
    • 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_off0001f91f.bin
30b40af6a8ae4f4d2a68394346b41803a203291351dbe792419a7d49c973ed75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1F91F 5148 bytes
font_01_sfnt_off00020a90.bin
c9968f8b4a12897cbda661a79d49308c63fda5c6201d22dca3a04f82a49d6c31		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A90 10692 bytes

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