Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc39920ade75f51…

MALICIOUS

PDF

78.2 KB Created: 2021-03-20 10:04:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: a346fd6d657e92c914cd4d1b74b2c2a1 SHA-1: e7a1f4f50417af77cc47baf4ea617935be0e43b3 SHA-256: cbc39920ade75f51a0653f32def2e304032b425cc025478e8a1bd53e55ca1a7d
156 Risk Score

Malware Insights

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

The PDF document contains a significant number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary URLs, 'https://vilenefex.ru/123?utm_term=fuji+mountain+guides+site', is flagged as unknown reputation, suggesting a potential malicious destination. The ClamAV detection and ML classifier further support the malicious nature of this file, indicating it is likely a phishing or trojan delivery mechanism.

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
  • 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.
  • 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://vilenefex.ru/123?utm_term=fuji+mountain+guides+site PDF link annotation
    • http://ganitigusawev.mygamesonline.org/68066126471.pdfIn PDF document text
    • http://kawlites.online/92962248345uma7l.pdfIn PDF document text
    • http://sodaapp.pro/56758416892m38wl.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/brinkmann_smoke_n_grill_5_burner_parts.pdfIn PDF document text
    • http://limaxinsto.xyz/simple_to_do_list_template_excelfq52q.pdfIn PDF document text
    • http://community-day.ru/jefotifiwiwexiniz7g2w.pdfIn PDF document text
    • http://veruvipavopa.getenjoyment.net/ranifafotofojugo.pdfIn PDF document text
    • http://vizenam.medianewsonline.com/dikaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_3aa60088320d48a093f48d02a0f49f0d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zuguvoxoki/confidentiality_agreement_template_for_counseling.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef2ea237-98fb-4da7-a91f-7303a566e37e/25144304032.pdfIn PDF document text
    • https://s3.amazonaws.com/davubewu/bemegebezolubenonaf.pdfIn PDF document text
    • https://67dec473-0a9c-497c-80b1-62a4c84c5046.filesusr.com/ugd/0aab01_dfdd2d8614be4d339fb1dc41b8b899d7.pdf?index=trueIn PDF document text
    • https://cd753cf5-d90a-4073-9c55-931a76e81761.filesusr.com/ugd/8826df_d09608b40b27424f8b5ef25a138b46ae.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fezenur/gituxu.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/dibikutigeseno.pdfIn PDF document text
    • https://s3.amazonaws.com/lekelepowo/46036806846.pdfIn PDF document text
    • https://s3.amazonaws.com/wofaxil/litibufivavekibugageb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d52d75a-1091-4b7b-b1ee-0ee72d4f7149/zoho_social_media_login.pdfIn PDF document text
    • https://d1b33a7b-cde1-45d4-bc15-d4d3b6236ac5.filesusr.com/ugd/1d64af_6277fb1d57cd48159baaa432d3299372.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ded0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDED0 5048 bytes
SHA-256: e43cc7f42c052f9ae88fb8443fa09fe710c7b256fd9aa1cf8204e45d31a476d2
font_01_sfnt_off0000eff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF4 10580 bytes
SHA-256: fb2009a3c97247334fdcf5effc346268463e99aa8fb35f721791945727c5acd2
font_02_sfnt_off000113fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FE 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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