Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6f1e55376eb05bb…

MALICIOUS

PDF

72.0 KB Created: 2021-04-01 15:54:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c2ba1d9eef9998cfe6cecd51649408aa SHA-1: 166f6c60f1df392fb0304a57fee28df865f4569a SHA-256: d6f1e55376eb05bb5d47b09dfef5db05c1b8390af2ea0255783cacefa8d35b87
186 Risk Score

Malware Insights

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

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 0.9998

Heuristics 6

  • 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 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://pelibifir.ru/123?utm_term=gettysburg+battlefield+guide+book PDF link annotation
    • http://nemosixumeki.mypressonline.com/article_about_educational_technology_in_the_philippines.pdfIn PDF document text
    • https://kokujefep.weebly.com/uploads/1/3/1/4/131409677/9507814.pdfIn PDF document text
    • https://kobenavu.weebly.com/uploads/1/3/4/7/134714827/2919995.pdfIn PDF document text
    • http://sabowupab.iblogger.org/waxorovewakido.pdfIn PDF document text
    • http://ratedewu.scienceontheweb.net/google_search_console_website_anmelden.pdfIn PDF document text
    • http://fajamad.mypressonline.com/abbyy_transformer_3._0_serial_key_free_download.pdfIn PDF document text
    • https://bevozuvegala.weebly.com/uploads/1/3/3/9/133999301/jopasaz_kivisimine_pagedururopi_wodupifujimemug.pdfIn PDF document text
    • http://wojisub.mypressonline.com/77181301588.pdfIn PDF document text
    • http://farozemirig.scienceontheweb.net/nhs_choices_back_exercises.pdfIn PDF document text
    • http://bopalinowojege.iblogger.org/mathematics_project_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://faleferesevo.onlinewebshop.net/2005_honda_odyssey_shifting_problems.pdfIn PDF document text
    • http://faxiruvud.myartsonline.com/blouse_cutting_pattern.pdfIn PDF document text
    • https://e437b920-fa79-41d5-b67c-0ca059f4e77a.filesusr.com/ugd/d97c10_127e1a456e3b453392fc7668a315ccce.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wemazun/blacklight_retribution_game.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_bf02e0ade08a4071ad76a3a3ca7b569d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokudapele/audio_from_soundcloud_chrome.pdfIn PDF document text
    • https://ac685e6e-6442-44c0-91a1-b3a367e79ef2.filesusr.com/ugd/ce77c6_ab32e8d7c9a54de8816009d3c4d574dc.pdf?index=trueIn PDF document text
    • http://dazigeles.rf.gd/47293126599.pdfIn PDF document text
    • https://s3.amazonaws.com/nafamaragisek/is_the_shining_on_netflix.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_off0000dcb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB6 5412 bytes
SHA-256: f54a934964e25e2d1091add27587861365903e01962399dfb3ab19793fa86454
font_01_sfnt_off0000ef3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF3C 10356 bytes
SHA-256: fba55070418ab945f5d4aa9926cc7c93d43f463445cec5bd2b3306ef525a0a6d

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