Malicious PDF — malware analysis report

Static analysis result for SHA-256 43a5c251bacb7855…

MALICIOUS

PDF

76.0 KB Created: 2021-04-15 11:09:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 750126b4812b06d0622aec98d6780637 SHA-1: 9605ef7887a43530e8301499470e27ffdb8795ba SHA-256: 43a5c251bacb7855684bb718d1167f2d10dd8ab7521414ca39e7055964b45ffd
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://dugedepap.ru/strik?utm_term=the+endocrine+system+consists+of+what+types+of+organs PDF link annotation
    • http://towajemikof.iblogger.org/learn_actionscript_3.pdfIn PDF document text
    • http://kakafeg.scienceontheweb.net/dobipopoxunizoxis.pdfIn PDF document text
    • http://tevutubiwij.getenjoyment.net/xuwesufazeman.pdfIn PDF document text
    • http://xonitaj.mywebcommunity.org/what_was_the_seventh_man_speaking_style.pdfIn PDF document text
    • http://rovanenafet.getenjoyment.net/6382523942.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/conversation_lessons_esl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e2604e0b-f95a-4acb-b53f-a7db3827b2a1.filesusr.com/ugd/225520_266b71bbd92d46caa1eaf7157860b263.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5ae8fb8-c40a-4735-ae44-017e412fa104/xepizosax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba2aec73-ac07-42cd-91bb-4c84ee82c851/misbehaving_the_making_of_behavioral_economics_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/jutenojamega/bengali_sathi_movie_song.pdfIn PDF document text
    • http://jajuzefob.rf.gd/85731249050.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_adcb57266a764ce3b76114351e429de0.pdf?index=trueIn PDF document text
    • http://javoxowixeb.rf.gd/tolugubudim.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/rapufopa.pdfIn PDF document text
    • http://xifeloj.onlinewebshop.net/45348175096.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd15bd7-48e4-40a3-ab5d-32c96f230b65/machinery_handbook_first_edition_for_sale.pdfIn PDF document text
    • http://zorikeroz.onlinewebshop.net/rosokikoxebilojiwagex.pdfIn PDF document text
    • http://netojukab.rf.gd/enseanza_que_deja_el_libro_el_caballero_dela_armadura_oxidada.pdfIn PDF document text
    • https://s3.amazonaws.com/jigezilor/the_tattooist_of_auschwitz_symbols.pdfIn PDF document text
    • http://fazaburifug.myartsonline.com/medical_waste_management_project.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_off0000eb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB9C 5680 bytes
SHA-256: 8c4536caff96615ce41fba21143e70ef59943a7e0db71af1704808a34192d6f7
font_01_sfnt_off0000fee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEE0 10384 bytes
SHA-256: 0e502432fc2e3aea5988504168727c6671d5f33a2a7e88c4b842bac904d95678

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