Malicious PDF — malware analysis report

Static analysis result for SHA-256 af8aae3914b7a4ea…

MALICIOUS

PDF

76.6 KB Created: 2021-02-18 00:17:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 46e54f0f820986181cb0e5f8a23d7329 SHA-1: 72f32f8d384ef6b74fb0efa150419e3b8db50084 SHA-256: af8aae3914b7a4ea9cf24245ffa575fc50e30e34c4df3298014e41a3299b694b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a lure related to rent increases, as indicated by the document body and the 'SE_INVOICE_LURE' heuristic. It also contains external URIs pointing to potentially malicious domains, including one that appears to be a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the download of a second-stage payload via the embedded URLs.

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://druttle.ru/123?utm_term=is+there+a+limit+to+how+much+a+landlord+can+raise+your+rent+in+nyc PDF link annotation
    • http://tublitalia.space/goziwegixibut0jsgt.pdfIn PDF document text
    • https://cdn.sqhk.co/winelolibug/GvKGjcv/wheel_of_fortune_game.pdfIn PDF document text
    • https://cdn.sqhk.co/leredupodeka/ihzHggJ/dual_monitor_stand_32_inch.pdfIn PDF document text
    • http://meetchat.space/tiktok_followers_no_human_verification_or_survey_2020w5yw0.pdfIn PDF document text
    • https://cdn.sqhk.co/madumubo/a5jjvlI/safoninotepo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425229/normal_5fffd971a8c8d.pdfIn PDF document text
    • http://sokuzise.iblogger.org/purani_haveli_bhoot_film.pdfIn PDF document text
    • http://servisvds.ru/fekexosawonikeniwaqgvrq.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/tuwobovekegoziguwqbss.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gimerige.epizy.com/moxil.pdfIn PDF document text
    • http://tilixufevoj.epizy.com/c._a._t._s_apk_hile.pdfIn PDF document text
    • http://lavofedelozus.rf.gd/13509622894.pdfIn PDF document text
    • http://redikubegoda.epizy.com/update_android_box_x96.pdfIn PDF document text
    • http://texuxirim.epizy.com/zogikibarexejorekutuvadu.pdfIn PDF document text
    • http://xinudigiwuwa.epizy.com/10438832227.pdfIn PDF document text
    • http://vusevupitiwo.rf.gd/wozadipusisidiki.pdfIn PDF document text
    • http://degudodenotiva.rf.gd/airy_disk_fourier_transform.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_off0000eec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 5312 bytes
SHA-256: 4d7d7c44d6d1c7cf849fd98b03057679dfd6c3584dc3e3680b55bd772b8ff47a
font_01_sfnt_off000100bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100BC 10676 bytes
SHA-256: f1da48b0bf28b9bf272fa19f7d960c774f49f94aab0426957e47dd8813886a9f

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