Malicious PDF — malware analysis report

Static analysis result for SHA-256 d83abf66cd525155…

MALICIOUS

PDF

71.4 KB Created: 2021-03-21 12:23:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: adc0cad812ddf7f36c619d17668296cb SHA-1: 79d6cf360ce27e4d78c2af33423348a9c0a80f8c SHA-256: d83abf66cd52515537b83c646b7afef7ab542aaed82e9a496257ed79f1c3946b
196 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 point to SEO-optimized redirectors designed to trick users into downloading files. The primary redirector URL is 'https://druttle.ru/wix?keyword=guide+to+physical+therapist+practice+3rd+ed.+%25282014%2529', which is used in conjunction with an image lure. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wix?keyword=guide+to+physical+therapist+practice+3rd+ed.+%25282014%2529 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4367013/normal_603776fd43fa9.pdfIn PDF document text
    • http://ninotekega.mygamesonline.org/aroogas_menu.pdfIn PDF document text
    • https://lififotepul.weebly.com/uploads/1/3/4/3/134339298/4150883.pdfIn PDF document text
    • https://motoburibekisi.weebly.com/uploads/1/3/4/6/134623685/sogofapobejigokima.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484821/normal_60430a8b890c2.pdfIn PDF document text
    • https://tesafugefiwa.weebly.com/uploads/1/3/5/3/135318727/4503106.pdfIn PDF document text
    • https://zovavofesaduj.weebly.com/uploads/1/3/4/7/134770402/9f3b32f7c876.pdfIn PDF document text
    • https://xibatelilon.weebly.com/uploads/1/3/1/6/131637149/735a8ca59f.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/manifiesto_comunista_marx_y_engels.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fdba9b218708.pdfIn PDF document text
    • https://cdn.sqhk.co/webuzifinuno/Vaojfji/minion_masters_draft_cost.pdfIn PDF document text
    • http://vebifitapex.mypressonline.com/how_much_to_replace_highlander_hybrid_battery.pdfIn PDF document text
    • https://cdn.sqhk.co/povewepalu/PwiaggN/turn_off_emergency_alerts_iphone_8_canada.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/netinuwa/small_merge_word.pdfIn PDF document text
    • https://s3.amazonaws.com/vovabagubajegeb/kodibunozijoruvefiwox.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/7179493922.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/19146632687.pdfIn PDF document text
    • https://s3.amazonaws.com/wemazun/creation_tool_windows_10.pdfIn PDF document text
    • http://zudupaxub.myartsonline.com/business_administration_css_notes.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/lusesadiko.pdfIn PDF document text
    • https://s3.amazonaws.com/setaxilitozuko/autocad_civil_course_near_me.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/ninenibisafelunimejizim.pdfIn PDF document text
    • https://s3.amazonaws.com/tadevewuju/real_estate_appraisal_exam_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/chomsky_competence_and_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/xijalovelokolep/samsad_bengali_dictionary.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_off0000d723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD723 6056 bytes
SHA-256: 4d55f9dda306ee4cdd7ff3aca59a65436bd7c76aba2aeb09fe95d1ac44470a1c
font_01_sfnt_off0000ebdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDC 9760 bytes
SHA-256: 7919d7502c5c7385757dd292ac3d5227626a3a8264352ed7a0eebf7620ef58bd