Malicious PDF — malware analysis report

Static analysis result for SHA-256 5817769790794d87…

MALICIOUS

PDF

69.7 KB Created: 2021-03-26 08:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 17ea0fe80160244ef58dc3ddc6f4e927 SHA-1: cecd79e3875a7707126d0261a28e7bf4b3cdb537 SHA-256: 5817769790794d87569ac3c4d33584e6a4619d3b0af71cf35ab6aec8e8ba1693
196 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one to 'lnstagram-support.live', which is flagged as a suspicious lure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document's structure suggests it's designed to appear as a worksheet to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://druttle.ru/wix?keyword=infinite+limits+worksheet+doc
    • https://cdn-cms.f-static.net/uploads/4426279/normal_5fdb361f7d215.pdf
    • http://sunmarkt.ru/best_vegan_cookbooks_for_beginners_2018q6phi.pdf
    • https://cdn-cms.f-static.net/uploads/4388841/normal_602d5c71296e9.pdf
    • https://zidovularirijap.weebly.com/uploads/1/3/4/7/134718784/wutiv.pdf
    • https://static.s123-cdn-static.com/uploads/4458394/normal_5febfc76d8876.pdf
    • https://fixupusojorulu.weebly.com/uploads/1/3/4/4/134438709/dibizagitukegu.pdf
    • http://pestore.pro/race_ethnicity_and_national_identity8a9c2.pdf
    • http://lnstagramverifiedbadgeshelpcenters.net/yard_machine_lawn_mower_repairpach8.pdf
    • https://cdn-cms.f-static.net/uploads/4373301/normal_605b052187e69.pdf
    • https://kinefevemupopit.weebly.com/uploads/1/3/4/6/134631160/sibewipuwape_tifolifa.pdf
    • https://cdn-cms.f-static.net/uploads/4499319/normal_60254dc1916ea.pdf
    • https://cdn-cms.f-static.net/uploads/4475872/normal_6021664d6d5c9.pdf
    • https://rirusiwox.weebly.com/uploads/1/3/4/2/134265342/nawilu.pdf
    • http://idealica-italiaufficiale.website/physics_of_heavenkmmb8.pdf
    • http://lnstagram-support.live/gopelijavet26vu.pdf
    • https://static.s123-cdn-static.com/uploads/4380080/normal_5fcac9172c7e2.pdf
    • https://static.s123-cdn-static.com/uploads/4379220/normal_5fddb1b1cfd36.pdf
    • https://cdn-cms.f-static.net/uploads/4393890/normal_5fdc0eb59aa73.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/libeganot/rudusedeso.pdf
    • http://wadoromutisagar.myartsonline.com/gukubulaxuxopasita.pdf
    • http://givetupazowo.onlinewebshop.net/causes_of_inflation_in_ghana.pdf
    • http://makakanow.onlinewebshop.net/adhyatmik_pravachan.pdf
    • https://s3.amazonaws.com/bomifabipi/stephen_bigalow_high_profit_candlestick_patterns.pdf
    • https://s3.amazonaws.com/gedesisumi/fitted_sheet_clips_bed_bath_and_beyond.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6d6.bin
ff35358b96f68fd2d7644c80e08ce96c73f58f0292869ee80aadbb70f00eea3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6D6 4932 bytes
font_01_sfnt_off0000d77b.bin
c4ac6fe5acabd19e62bc07f2171de65a02f1454bcf9f4602c21062edb061daef		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD77B 9920 bytes
font_02_sfnt_off0000f985.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF985 4324 bytes

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