Malicious PDF — malware analysis report

Static analysis result for SHA-256 71a59a6a9b1415e1…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 07:12:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ecedb819d2b67b6e106c2315f8c6f18 SHA-1: 9a08ce4a301a75a26f48249f931934444d3b9b74 SHA-256: 71a59a6a9b1415e19254477e034647d18c8c5e3fe84a8cd6abed3b20f75d8601
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/wix?keyword=who+was+the+first+cat+to+go+to+starclan
    • https://cdn-cms.f-static.net/uploads/4455659/normal_5fea376d826f0.pdf
    • https://cdn-cms.f-static.net/uploads/4406202/normal_6046002c6d210.pdf
    • http://sibuvre.com/best_rock_ballads_ever8m5ux.pdf
    • https://static.s123-cdn-static.com/uploads/4381105/normal_6000766547b92.pdf
    • https://static.s123-cdn-static.com/uploads/4457296/normal_5ff9e91f6945a.pdf
    • https://tovejuzu.weebly.com/uploads/1/3/5/3/135398771/4e420fdb74.pdf
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/4659740.pdf
    • https://belibezininu.weebly.com/uploads/1/3/4/8/134850089/xapapi.pdf
    • https://static.s123-cdn-static.com/uploads/4477408/normal_5fc651f70bce3.pdf
    • https://cdn-cms.f-static.net/uploads/4482424/normal_60470838583d5.pdf
    • https://lovilubavovujag.weebly.com/uploads/1/3/4/6/134664731/8879545.pdf
    • http://greatmasters.biz/jabogon0qmsd.pdf
    • https://cdn-cms.f-static.net/uploads/4498404/normal_600f40e8dfa2e.pdf
    • https://cdn-cms.f-static.net/uploads/4382953/normal_5fe9b62299302.pdf
    • http://tifusavegapawuf.mygamesonline.org/twilight_breaking_dawn_part_2_extended_edition.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fuvarijes.atwebpages.com/viwanovizalitaraguzunekuz.pdf
    • http://nekelaxowe.atwebpages.com/puralujopesibijofuzoz.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed87.bin
84d6e04ab6322094c3129c929d1d725f3b493ad70ad2d52df0eba18739161d73
pdf-font-stream PDF embedded font (sfnt) at offset 0xED87 5248 bytes
font_01_sfnt_off0000ff7a.bin
f8d1adc262baaef2f9c18ed740ff109da6552d3d1fc143029934951699f2498a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF7A 11420 bytes