Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4a860c19dc0924…

MALICIOUS

PDF

79.0 KB Created: 2021-01-13 19:08:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 867fee2954500d2b82dc7b3a5c2f754e SHA-1: 715b04054d952b806eb26ee8106b448d0eb7d0d3 SHA-256: 6b4a860c19dc092468c3d92f3dd2b58e536982c4e15e1ded19404e3055ff0d58
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and ML classifiers indicated a high probability of maliciousness. Heuristics identified it as a link farm on disposable hosting, with numerous embedded URLs pointing to potentially malicious sites. The primary malicious URL identified is 'https://trafffe.ru/aws?utm_term=yannick+afroman+bakongo+2019'. Although no scripts were explicitly extracted, the nature of the embedded links and the detection names suggest a phishing or malware distribution attempt.

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://trafffe.ru/aws?utm_term=yannick+afroman+bakongo+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4499300/normal_5fc42910cc289.pdfIn PDF document text
    • https://site-1179443.mozfiles.com/files/1179443/stickman_football_the_bowl_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387586/normal_5faba010c1be2.pdfIn PDF document text
    • https://site-1174928.mozfiles.com/files/1174928/formalits_cession_vhicule_prfecture.pdfIn PDF document text
    • https://site-1175626.mozfiles.com/files/1175626/idle_bank_office_tycoon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455197/normal_5fa502a45d417.pdfIn PDF document text
    • https://site-1180799.mozfiles.com/files/1180799/net_framework_2__0_sdk_vcbuild__exe.pdfIn PDF document text
    • https://site-1178227.mozfiles.com/files/1178227/talking_to_a_lion_in_a_dream.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463788/normal_5ff3bc165d40b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464702/normal_5fd98726a0572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412778/normal_5fbfd31a94a1b.pdfIn PDF document text
    • http:///\/dawnthemes.com\/viem,preroll_mp4:http:///\/dawnthemes.com\/player\/videos\/Logo_Explode.mp4,prerollSkipTimer:5,midrollAD:no,midrollAD_displayTime:00:10,midrollGotoLink:http:///\/dawnthemes.com\/viem,midroll_mp4:,midrollSkipTimer:5,postrollAD:no,postrollGotoLink:http:///\/dawnthemes.com\/viem,postroll_mp4:,postrollSkipTimer:5,popupAdShow:no,popupImg:,popupAdStartTime:00:03,popupAdEndTime:00:07,popupAdGoToLink:http:///\/dawnthemes.com\/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zonebon/fabawevinuxirilis.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/dojavazepevokudin.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/guardian_speedy_crossword_1210_answers.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_off0000d360.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD360 5640 bytes
SHA-256: 6b2accf31b5e80b976e1f4129318ecb907d8a46853409e02fa98fb1c53423331
font_01_sfnt_off0000e690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE690 12984 bytes
SHA-256: 77d6502702e6d014159b57bf23a296847d61a4eeffb8c05db4984c5193837d87
font_02_sfnt_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 18776 bytes
SHA-256: 9e8409b995ac2b0bb76eb3eb8dd1c90fa55d1c1c8a40bb5daa08ca4080948d13

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