Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a4dd763dfd20756…

MALICIOUS

PDF

63.2 KB Created: 2021-02-20 17:27:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 5466f93c0dfece5d82a88c427554c809 SHA-1: 43dc36c861f8fe8fb2ff5d3880335f690c702cb1 SHA-256: 6a4dd763dfd207560ebabe3d826e2333c479a2d489200cd4922ee3927c5c40fc
126 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, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, which are characteristic of link farms designed to distribute malware or phish for information. The document body, though heavily obfuscated, appears to contain keywords related to software comparisons, likely serving as a lure.

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://jottigo.ru/wb?keyword=fl%20studio%20signature%20vs%20ableton%20live%20standard PDF link annotation
    • http://dakejexisumupok.iblogger.org/48928357997.pdfIn PDF document text
    • http://instacopyrightcenter.com/87169432659pbhos.pdfIn PDF document text
    • http://trynutra.shop/how_to_calculate_rpn_in_fmeasqjbp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387230/normal_5feb064d0fefe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366369/normal_5fcb64df69321.pdfIn PDF document text
    • http://ronerikasov.22web.org/can_you_use_airplay_with_a_samsung_phone.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386080/normal_5fed255d1fc06.pdfIn PDF document text
    • http://complect-tech.ru/476520882617cxk9.pdfIn PDF document text
    • http://raisinslabs.club/sabanejam13ghv.pdfIn PDF document text
    • http://naturmilans.fun/ge_dryer_f70_codeo35dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447640/normal_601bd105438ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495855/normal_5fe74c6dbfb93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://motatowavem.epizy.com/concurrency_in_c_cookbook.pdfIn PDF document text
    • http://kazoverowagodi.epizy.com/pink_linen_sheets_uk.pdfIn PDF document text
    • http://nazudogaribuge.rf.gd/26868060321.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/doraemon_cartoon_2018_free.pdfIn PDF document text
    • http://xiwularofevomu.epizy.com/blue_eyes_dj_song_free.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_off0000bb5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB5B 5148 bytes
SHA-256: 6c638cad992c2ce57f597d45daaabdaa5320721a086998911944407af184211e
font_01_sfnt_off0000ccf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCF1 10104 bytes
SHA-256: 3a3ede52f32340939303cba0f30fd62a2538cefffeee0eb2a170a46eb522d55d

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