Malicious PDF — malware analysis report

Static analysis result for SHA-256 c768313e6b1e9ab4…

MALICIOUS

PDF

114.6 KB Created: 2021-01-25 21:42:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 6c859d0a46d878bc6a7587880fbe7786 SHA-1: ebe02f9907eed3a4b3b47e026775417a261aba26 SHA-256: c768313e6b1e9ab4b3de4127abcfac68eaa396416265b5abc23005469efcf800
184 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, with a critical heuristic firing indicating a link to known malicious redirector infrastructure. The ML classifier also flagged the PDF with high confidence. While no scripts were extracted, the prevalence of links to disposable hosting and redirectors strongly suggests a phishing or scam campaign designed to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffking.ru/aws?utm_term=aria+allergic+rhinitis+guidelines+2015 In PDF document text
    • https://debozapo.weebly.com/uploads/1/3/1/1/131164198/4a0f1a214.pdfIn PDF document text
    • https://cdn.sqhk.co/vizoxaxijojo/EoFzGhh/epic_battle_simulator_2.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/Rheids0/1182635382.pdfIn PDF document text
    • https://wiziligi.weebly.com/uploads/1/3/5/3/135306295/gegiputajukeja.pdfIn PDF document text
    • https://majijajivetik.weebly.com/uploads/1/3/4/2/134265766/87b57d02c7.pdfIn PDF document text
    • http://xudisoda.66ghz.com/33275185195.pdfIn PDF document text
    • https://cdn.sqhk.co/juxerawabuf/ichiFSI/22159601067.pdfIn PDF document text
    • https://kefomituwo.weebly.com/uploads/1/3/2/8/132815939/fozow.pdfIn PDF document text
    • https://ledajesaler.weebly.com/uploads/1/3/4/0/134041179/gogelabefel.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/ifjjgic/ziraleluwagipige.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://waxaravibew.epizy.com/zaludonugitavapedexi.pdfIn PDF document text
    • http://degejukifukux.epizy.com/43742216458.pdfIn PDF document text
    • http://panafinuniro.epizy.com/xabidivuxovisake.pdfIn PDF document text
    • http://faduzidivatakid.epizy.com/fulujugodesumisutetivefe.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/60802502465.pdfIn PDF document text
    • http://lusafawapinoxe.rf.gd/matavalavijaruzof.pdfIn PDF document text
    • http://midekudaxigol.rf.gd/boarding_houses_act_2012.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_off00017ed5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17ED5 5640 bytes
SHA-256: 44359f2d80286b6b7666b23b09b036c157b2fae17342499d5d90900b6ebd80c0
font_01_sfnt_off00019201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19201 14660 bytes
SHA-256: 34fb1faf8795293e4d6523d31b01fe4920f882ac6917fdee93124a7ccb766343

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