Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f85f057371a28f…

MALICIOUS

PDF

117.6 KB Created: 2021-03-25 13:32:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7d5b50bb58c3efdc495a6425ddc841d9 SHA-1: 84292e465593b7605e44c8619f19f4b3794f956f SHA-256: d5f85f057371a28f655348106a97b61888e4c90d24a93bbf3eb6014074b1f2ed
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were extracted, the presence of numerous external URIs indicates an attempt to redirect the user to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://ponafet.ru/123?utm_term=plain+yogurt+nutrition+guide PDF link annotation
    • https://toruganaduloxo.weebly.com/uploads/1/3/5/3/135347606/kejanizogewesukozo.pdfIn PDF document text
    • https://sobidoduwipiver.weebly.com/uploads/1/3/1/4/131406433/f4d88bcf052fd19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459035/normal_6019dc88b6a2e.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/xivurozo.pdfIn PDF document text
    • http://xiwakaravivomik.scienceontheweb.net/soposuludap.pdfIn PDF document text
    • https://begosibaluta.weebly.com/uploads/1/3/0/7/130775163/subogimazexavemawab.pdfIn PDF document text
    • https://jaxirifaru.weebly.com/uploads/1/3/4/5/134500995/dajujisojisu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373519/normal_60083be7036be.pdfIn PDF document text
    • http://warowusavi.mywebcommunity.org/balancing_chemical_equations_worksheet_grade_10_cbse.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/28533570042.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/zoxewudunigus/bihar_daroga_mains_question_paper.pdfIn PDF document text
    • http://zotubune.myartsonline.com/baxugowejarizexi.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_95cd7fefc03d401c8ebd8206d42fd7ca.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dorobukasawituw/dujunewop.pdfIn PDF document text
    • http://ladurabazidema.onlinewebshop.net/charlie_and_the_chocolate_factory_scenes_list.pdfIn PDF document text
    • https://21c505bb-01ca-4817-a549-4ed1ebba5040.filesusr.com/ugd/7d7105_10b172ad6d554d19ac0f4f40d778924f.pdf?index=trueIn PDF document text
    • https://7d6e376e-1ee3-4df5-88c1-8d1511d419f8.filesusr.com/ugd/7dd30d_d4cea5b057314fba97dab27536f25b84.pdf?index=trueIn PDF document text
    • http://redifigikutusoj.myartsonline.com/mapuk.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/descargar_zacarias_ferreira.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_off00017a7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A7D 4920 bytes
SHA-256: 6cd8e046143272044ac11b8a618145dd53c8ca12a93b3fbceac8124ab3589317
font_01_sfnt_off00018b52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B52 12016 bytes
SHA-256: 0f409fadd83be34fd1e42aa65443ee43df0751c18380ffb6232b8f2fb457530c
font_02_sfnt_off0001b3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B3F6 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f