Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f387431176f581e…

MALICIOUS

PDF

80.1 KB Created: 2021-04-18 15:04:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 104b524c1820ea978e4d72d1600ffb7c SHA-1: e605040e8703fcc8ac2b00d88fa7b4998e5073cd SHA-256: 0f387431176f581e071641dceaa9b622b99be143150361d11bf154f6ff8c9bac
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/strik?utm_term=bear+cruzer+bow+manual
    • https://cdn-cms.f-static.net/uploads/4489257/normal_602a76f39c0cd.pdf
    • http://djami.ru/how_to_get_a_referee_license_for_socceryftk1.pdf
    • http://momentshop.website/69393140045nefce.pdf
    • http://soxitezi.iblogger.org/13765277954.pdf
    • http://kosolamod.22web.org/wordscapes_uncrossed_all_answers.pdf
    • http://ogranifruit.space/bexotujilik801.pdf
    • http://lnstagramsupportinfo.com/que_se_puede_hacer_en_la_fase_dos2cvnv.pdf
    • http://kulinar2020.site/acupressure_points_in_kannadamrgep.pdf
    • https://todatukutazatu.weebly.com/uploads/1/3/5/3/135309816/xetikap-jowisebefofewe.pdf
    • https://cdn-cms.f-static.net/uploads/4368250/normal_60206877e8f33.pdf
    • https://barezixajeg.weebly.com/uploads/1/3/4/3/134318527/watorixebipu_xepimos_purapogazi_vijiguvisijapi.pdf
    • http://magnetfix.store/english_for_everyone_level_1_beginner_practice_book_downloadpvy13.pdf
    • http://polikarmonolit.ru/cisco_air_lap1142n_a_k9_setuplf0xl.pdf
    • https://cdn-cms.f-static.net/uploads/4482854/normal_604dde3765901.pdf
    • https://kenomixu.weebly.com/uploads/1/3/0/9/130969587/5927572.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://xewaditina.epizy.com/simple_biodata_format_file.pdf
    • https://s3.amazonaws.com/xomudufe/boy_scouts_of_the_philippines_handbook.pdf
    • http://fadevosozegula.epizy.com/strategic_management_of_technological_innovation_free_download.pdf
    • http://gavojomizam.epizy.com/ankusham_telugu_songs_free.pdf
    • https://s3.amazonaws.com/mekonulegipero/hdfc_mutual_fund_systematic_investment_plan_form.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3ec.bin
66c0501feadbcce10212b206343a4f7bf2e955dd3434449b3381ee2aded163dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3EC 5100 bytes
font_01_sfnt_off00010542.bin
daad3f347a4f42f432ee9983e619a7c063e36761dba5934b469418034847e28e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10542 1800 bytes
font_02_sfnt_off00010dd0.bin
a80481c2b74e219588315ffaa47d1af8e339ebe78c26eba4b589e1be09a6ae0b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD0 10924 bytes

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