Malicious PDF — malware analysis report

Static analysis result for SHA-256 bce9f2627399b7a8…

MALICIOUS

PDF

76.5 KB Created: 2021-04-23 21:50:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 657fb1e5a465ce35a82657b39cba36f9 SHA-1: dc9049e82e2a070eb215f9a70d69633642d285d0 SHA-256: bce9f2627399b7a8827e9fe453510bae91ec65bbd13a71504772022179adbf3b
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=how+to+fake+location+on+tinder+android PDF link annotation
    • https://cdn.sqhk.co/texonatuzi/hdoCgjM/36534559927.pdfIn PDF document text
    • http://pebimubegema.22web.org/antigone_robert_fagles.pdfIn PDF document text
    • https://cdn.sqhk.co/tifobebe/V5gchbG/mental_health_top_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/sovokeduseb/dziiMjh/zumekokizegitu.pdfIn PDF document text
    • http://powuvomewekuxeb.getenjoyment.net/citizenship_definition.pdfIn PDF document text
    • http://rastet-malysh.ru/marvel_contest_of_champions_apk_data_offlinefgh3z.pdfIn PDF document text
    • http://lozipazom.sportsontheweb.net/4484605217.pdfIn PDF document text
    • https://cdn.sqhk.co/rovovuroj/WhiqZhd/atm_card_request_form_sbi.pdfIn PDF document text
    • https://cdn.sqhk.co/runolisor/tHienUg/99068703103.pdfIn PDF document text
    • http://serodot.iblogger.org/what_is_the_most_mentioned_topic_in_the_bible.pdfIn PDF document text
    • http://godulonu.22web.org/vigiropike.pdfIn PDF document text
    • http://crawlmqyu.space/amazon_alexa_black_friday_deals_20190n4jd.pdfIn PDF document text
    • http://counterman.ru/tukitiwav6x73.pdfIn PDF document text
    • http://kefitetapirep.22web.org/bokimudepikul.pdfIn PDF document text
    • http://skout.tech/394121590763n2dy.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_232dfdf9d84842cda3a6608dcc053b31.pdf?index=trueIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_925a053e59b14d70828f5512a0e84383.pdf?index=trueIn PDF document text
    • http://kurejob.epizy.com/zuremuzak.pdfIn PDF document text
    • http://nitubak.atwebpages.com/the_cask_of_amontillado_questions.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_6fe2ce2737d3465c80c54775b74541f6.pdf?index=trueIn 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_off0000ec87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC87 4956 bytes
SHA-256: c519f4c2306636f1f9116d442bb3c218fac8647670d4dd1b8d3f214a5ad6927b
font_01_sfnt_off0000fd85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD85 10892 bytes
SHA-256: 72e2de87bb670f946187506b54d6c83d9c6d609ca20c2b0f9f369efafa65106b

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