Malicious PDF — malware analysis report

Static analysis result for SHA-256 8562da007300449b…

MALICIOUS

PDF

78.9 KB Created: 2021-05-17 12:22:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 6b4661b9f3b8940150c1094b4269fe11 SHA-1: 17f9dab62bd131a18193bc460aee1018996fdc6e SHA-256: 8562da007300449b57bb1975298994a6dbd76637b925f84aab501fa9429587e2
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a primary external URI pointing to 'https://vilenefex.ru/strik?utm_term=aimpoint+pro+best+price+2019'. Heuristics indicate this PDF functions as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://vilenefex.ru/strik?utm_term=aimpoint+pro+best+price+2019 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4455886/normal_6016c9874d1a4.pdfIn PDF document text
    • https://tijabitosivu.weebly.com/uploads/1/3/4/3/134396728/3996843.pdfIn PDF document text
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/miwufok_fixogusafoguxu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413110/normal_604470a7ce8c7.pdfIn PDF document text
    • http://xejapuz.getenjoyment.net/vugosafamilomemalim.pdfIn PDF document text
    • https://somigoduwus.weebly.com/uploads/1/3/4/4/134470899/4927386.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458431/normal_5ff8a91442900.pdfIn PDF document text
    • http://oficialshoes.site/how_to_start_a_mr_coffee_machinei4pb5.pdfIn PDF document text
    • http://nakrutkavk.site/verasepusiravawukimikiudzq7.pdfIn PDF document text
    • http://vurujupafowutox.mypressonline.com/can_you_gain_weight_from_almond_milk.pdfIn PDF document text
    • https://giloxegikejuzun.weebly.com/uploads/1/3/4/7/134712531/simenotimubezatabog.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/809410b3-fdc6-4e37-9201-8e671ecc5b2f/canon_imageclass_mf4450_printer_driver_download_for_windows_10_64_bit.pdfIn PDF document text
    • http://perinuve.epizy.com/bruchrechnen_bungen_mit_lsungen.pdfIn PDF document text
    • http://lutatiduz.epizy.com/lanejarufiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6599541-16e4-4a3c-a533-05f500956cb3/italian_restaurant_walt_whitman_mall.pdfIn PDF document text
    • http://nabiporemug.epizy.com/android_21_voice_actress.pdfIn PDF document text
    • http://beguresenoraw.epizy.com/comptia_pentest_plus_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e404170d-161f-41a0-9797-083d372770ad/how_well_can_you_follow_directions_the_united_states_of_america.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36E 5448 bytes
SHA-256: d83193b5fb21618973a049980b36a15857d0be489fc26f6680a9f766c4d64571
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 12140 bytes
SHA-256: 4cbb238db86e1aa1e37018dddfef81d7bf111ebd3e6e087fd01b09f8de0c3c84

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