Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d95ca1edff28b47…

MALICIOUS

PDF

98.4 KB Created: 2021-02-19 18:45:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 80340e8cf456e51804b7d88bd4bcd4ce SHA-1: 77f44d89e7e4c62f23a075926f7b72efaee0e55b SHA-256: 5d95ca1edff28b472ff2d0706b60f1e17c5e9c24cb19016fe75b60ab48c9623e
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs, indicating a link farm or SEO abuse tactic. The primary external URI, 'https://jottigo.ru/strik?utm_term=metal+gear+solid+5+quiet+model', suggests a lure to a malicious site. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan.

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://jottigo.ru/strik?utm_term=metal+gear+solid+5+quiet+model PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4413573/normal_5ff48c0b86f3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403806/normal_5fd60fdbe8a82.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421335/normal_5ffbc4e16a610.pdfIn PDF document text
    • https://tiruzezisuwef.weebly.com/uploads/1/3/4/4/134499189/3158102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5fff3e77bf49c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378164/normal_6012bc9dc7d23.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/hh3ibgg/bubble_freedom_download_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fewukise/bijEicY/astral_lucky_block_race_popularmmos.pdfIn PDF document text
    • https://cdn.sqhk.co/wejawujagi/ghiiijq/20528200376.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384167/normal_5fd8e21cb2609.pdfIn PDF document text
    • https://cdn.sqhk.co/kugorazig/GVjjmgp/zuled.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387716/normal_6023f2ee84254.pdfIn PDF document text
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/deruw.pdfIn PDF document text
    • https://cdn.sqhk.co/narobalof/rhcGqha/mechanics_bank_close_to_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365555/normal_6020fcc0e0443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474191/normal_600b97037e476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404959/normal_6009bc3ec520d.pdfIn PDF document text
    • https://fojaruzagix.weebly.com/uploads/1/3/1/3/131379198/9934995.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_5fdad35a2cde0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370076/normal_5fca97664f0f6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0001178a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1178A 12244 bytes
SHA-256: d7846ac26d65fffd5af3d7ae4f05c33c551d3dfd2c09a0f02a4824de7459d5e8
font_01_sfnt_off00014044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14044 5400 bytes
SHA-256: fdf144ab05e75e5c377539fc38654aaacd68616fd3a54c7e345fd55e98a9bf6c
font_02_sfnt_off00015293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15293 12444 bytes
SHA-256: cfbf9a5477868c29c93a2ad2058d365cfe689c06c1f0362b9f792cc102640e8f

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