Malicious PDF — malware analysis report

Static analysis result for SHA-256 759c88521bbbb4f2…

MALICIOUS

PDF

79.5 KB Created: 2021-03-03 09:48:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: e412f5323c2f3e8d8398a3a4eb94bc12 SHA-1: ae72d43c1b68f3386c3ad3b87453ef0cae68b9c7 SHA-256: 759c88521bbbb4f29ce0082cf1e366fdd2a0ee289246fb02ff8409cf1fd1fe86
184 Risk Score

Malware Insights

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

The PDF contains embedded links pointing to malicious redirector infrastructure, specifically identified by the 'PDF_MALICIOUS_REDIRECTOR_LINK' heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, appears to contain keywords related to a product, likely a lure to disguise the malicious link. The primary attack vector is likely spearphishing attachment, leading to a redirection to a malicious site.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=graco+milestone+3+in+1+convertible+car+seat+infant+to+toddler+car+seat+gotham In PDF document text
    • https://cdn-cms.f-static.net/uploads/4485580/normal_602eba4b189f6.pdfIn PDF document text
    • http://vinnipoh.space/car_parking_and_driving_simulator_hack_mod_apkziabp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485445/normal_600a18757b461.pdfIn PDF document text
    • http://jusefaw.22web.org/ragejove.pdfIn PDF document text
    • http://lololoj.sportsontheweb.net/21710447203.pdfIn PDF document text
    • http://shoop-fg.ru/roginowodoxin45bpe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408584/normal_5ff60667cabd8.pdfIn PDF document text
    • http://xogunajeraxuda.mywebcommunity.org/69279714824.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385848/normal_600b444c077a1.pdfIn PDF document text
    • http://groshyk.site/ronetedovulixecwwr8.pdfIn PDF document text
    • http://xoziduso.mypressonline.com/4217304762.pdfIn PDF document text
    • http://winoorama.fun/eldar_craftworlds_codexh2wbo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tekunobujolid.epizy.com/investigations_3_math_answer_key.pdfIn PDF document text
    • http://zomefikike.rf.gd/levenson_self-_report_psychopathy_scale_scoring.pdfIn PDF document text
    • http://rebivik.epizy.com/46_bike_race_video.pdfIn PDF document text
    • http://gojeduxodevesif.epizy.com/28982190069.pdfIn PDF document text
    • http://kuzemepusiloj.onlinewebshop.net/befomosijenip.pdfIn PDF document text
    • http://selamamoli.epizy.com/wijujebofekalunovajamo.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_off0000f3c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C8 5884 bytes
SHA-256: 8504d1c77f1151598041a1b8ccaef0e1aeba02d92bbe6eb162aa623ff17a01ef
font_01_sfnt_off000107b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107B0 12672 bytes
SHA-256: fcb55f54d55dfef1bd47050b78a7a33fb2b530628d940798c6daa0e00b831826

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