Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c7cb2118d633e9d…

MALICIOUS

PDF

74.5 KB Created: 2021-01-20 13:46:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c28d229eb98a3fd65974f167b074df76 SHA-1: 735cc0a515d2c2c1bba674cf341741da667e95c9 SHA-256: 1c7cb2118d633e9d87666203a581e7916d8c1470f345080f6b00079c081aaf3e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a link farm, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ML classifier and ClamAV detection strongly indicate maliciousness, with the latter identifying it as a 'Pdf.Phishing.Trojan'. No scripts were extracted, but the structure and numerous external links are indicative of a phishing or SEO-based malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jottigo.ru/123?utm_term=direct+vs+inverse+proportion+graph
    • https://gumakamatiz.weebly.com/uploads/1/3/4/6/134600955/lakobilujaxuvolap.pdf
    • https://fobanuvoba.weebly.com/uploads/1/3/1/6/131637247/c5f11e.pdf
    • https://cdn.sqhk.co/zegetaru/bahi9ge/13674293037.pdf
    • https://cdn-cms.f-static.net/uploads/4423430/normal_5f9bcf961ba02.pdf
    • https://static.s123-cdn-static.com/uploads/4495269/normal_6002715a970e2.pdf
    • https://cdn-cms.f-static.net/uploads/4377114/normal_5fa6d3b971e8a.pdf
    • https://static.s123-cdn-static.com/uploads/4461748/normal_5ff4380c0c895.pdf
    • https://static.s123-cdn-static.com/uploads/4481164/normal_5fd038ef09636.pdf
    • https://fifeguku.weebly.com/uploads/1/3/4/7/134733895/vaxigapowa.pdf
    • https://cdn-cms.f-static.net/uploads/4372373/normal_5f89dd423bece.pdf
    • https://nepuvojikonutoz.weebly.com/uploads/1/3/4/6/134677469/vuvatenajosefot.pdf
    • https://vugevosuza.weebly.com/uploads/1/3/5/3/135328642/jenogavepilor.pdf
    • https://cdn-cms.f-static.net/uploads/4380214/normal_5f8f17c6cc279.pdf
    • https://rinotawobuv.weebly.com/uploads/1/3/4/7/134768279/eab17.pdf
    • https://ranitezal.weebly.com/uploads/1/3/1/4/131438109/fopenale.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/bulolimepol/razube.pdf
    • https://s3.amazonaws.com/liwafo/fuzapaj.pdf
    • https://s3.amazonaws.com/runuzitexokol/baliraxiwonixi.pdf
    • https://s3.amazonaws.com/sojuravewi/59839541003.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd9f.bin
82ff65a7334e140408ad5605a7303c440579281c522ae426f1e1b88b11dd69e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9F 5224 bytes
font_01_sfnt_off0000df71.bin
f0fc325d6127f65fb1333ce9a9bc00a5eb4c3e05042dc306786b4e0ed74f39ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF71 11612 bytes
font_02_sfnt_off00010738.bin
2fbb528c30fae61c70ff4082faa5fece981988df10abad1a91cab371b780b9de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10738 16192 bytes

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