Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9e0cde5204e3246…

MALICIOUS

PDF

81.3 KB Created: 2021-04-19 05:41:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 90826cb6d4f035cd3785eff8e29f1d71 SHA-1: 77cbd8b451081b21a297f3c1b4b89bc18f637081 SHA-256: c9e0cde5204e3246c80ff742f94fb8362ed7229aa64de3b2e9cf376430708baa
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by both ML classification and ClamAV, indicating a high likelihood of malicious intent. The file contains a large number of external links, many pointing to disposable domains, suggesting it functions as a link farm or a phishing lure. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic further support this, indicating the document's primary purpose is to redirect users to potentially harmful external sites. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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.
  • 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://resalured.ru/strik?utm_term=echo+gt+225+carburetor+rebuild PDF link annotation
    • https://fojifipavubi.weebly.com/uploads/1/3/4/6/134618349/luxowuwawu_pidolakexebavuv.pdfIn PDF document text
    • http://nebofimanigi.sportsontheweb.net/95415688644.pdfIn PDF document text
    • http://vitolebizojigok.22web.org/callan_method_stage_6_chomikuj.pdfIn PDF document text
    • https://wudusalulolatus.weebly.com/uploads/1/3/1/6/131606476/72fea2f332563.pdfIn PDF document text
    • http://pusosokus.iblogger.org/xetodibepuwafamuretumilos.pdfIn PDF document text
    • https://wajifisawebe.weebly.com/uploads/1/3/4/4/134480175/9651503.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/7792852.pdfIn PDF document text
    • https://rewesiriwo.weebly.com/uploads/1/3/4/3/134318955/9516783.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/6211b928-4142-450e-b8bb-f200cb45c108/what_is_the_purpose_of_the_criminal_justice_system_in_australia.pdfIn PDF document text
    • http://lixumogal.epizy.com/breakthrough_advertising_book.pdfIn PDF document text
    • http://lugivodunoxasi.atwebpages.com/91166323448.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec32f647-ad53-4a0e-a765-40eae97412fe/speak_by_laurie_halse_anderson_characters.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c8f4ad-54fe-43b6-a6d1-cb76ee3cc735/what_is_the_dirtiest_cards_against_humanity_box.pdfIn PDF document text
    • http://vujapoguxesak.myartsonline.com/syntactic_categories_and_grammatical_relations.pdfIn PDF document text
    • http://zaduzos.myartsonline.com/definition_of_business_research.pdfIn PDF document text
    • http://tibamupebunod.atwebpages.com/dubitupatilujatepiwir.pdfIn PDF document text
    • http://meguler.rf.gd/active_and_passive_voice_exercises_for_class_8.pdfIn PDF document text
    • http://sewosugopig.rf.gd/reviving_ophelia_movie_ending.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7ae818-6746-48fa-a977-882021372c26/talubudemawaketonofub.pdfIn PDF document text
    • http://zozoramotuwiv.rf.gd/boring_operation_on_lathe_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f54f9fc-36d7-4b6e-84b1-ea27bcd61e62/professional_growth_goals_examples.pdfIn PDF document text
    • http://xabirixulixe.epizy.com/wondershareelement_6_professional_reviews.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ea2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2F 5376 bytes
SHA-256: 16bdc65db9178a8be8eda114771645dbf23b03c21c45657ad12a045cef81e6eb
font_01_sfnt_off0000fc78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC78 11272 bytes
SHA-256: deb8eabc89f82664735a4de649c2ba2fcdf5442f155f35e757f17bbc730a7a0c
font_02_sfnt_off000122fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122FB 16092 bytes
SHA-256: 39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67

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