Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1486e5d584fce2d…

MALICIOUS

PDF

77.6 KB Created: 2021-04-04 19:21:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c14fca06c9a04afc55d305c5d1fd8a84 SHA-1: d190a907e411a91f498d8e5a3fc8c7107a38f1cd SHA-256: f1486e5d584fce2d90d46d81651c6fda9b88dc9357df9875c736baf0e085d58f
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 pointing to PDF files, suggesting a link farm for SEO manipulation or phishing. ClamAV and ML classifiers indicate malicious content, specifically identified as phishing and a trojan. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly suggest this document is part of a campaign to distribute malicious content or phish users, likely using the 'tax refund calculator' lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://resalured.ru/wix?keyword=tax+refund+calculator+2020-21
    • https://dimomivij.weebly.com/uploads/1/3/4/5/134504604/9728566.pdf
    • https://xikobidena.weebly.com/uploads/1/3/6/0/136097244/lopabivekares_munexekesaxeze_nesif.pdf
    • https://cdn.sqhk.co/salosegebomi/hfIicBx/50889462507.pdf
    • https://cdn.sqhk.co/nagebagem/jjggepx/telemedicine_jobs_for_physicians_in_california.pdf
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/mararosenatelom-titefufekijewi-maferunozivulik.pdf
    • https://cdn.sqhk.co/mamidusidozu/kkUf3Eu/74230742674.pdf
    • https://lonurosoriwe.weebly.com/uploads/1/3/5/9/135985322/3271208.pdf
    • https://cdn.sqhk.co/rivotoxupow/jjjfIw4/pepetifirumota.pdf
    • https://wajegeteb.weebly.com/uploads/1/3/4/8/134896445/zisexul.pdf
    • https://dezamemev.weebly.com/uploads/1/3/4/7/134746632/9fffd.pdf
    • https://vemowidododujev.weebly.com/uploads/1/3/4/3/134353566/33d5ea17cff1.pdf
    • https://widosogepe.weebly.com/uploads/1/3/3/9/133986955/8926160.pdf
    • https://cdn.sqhk.co/mabisurud/eiaZYrx/73317762940.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://gifimedirawi.epizy.com/sasapewobupizujaram.pdf
    • https://s3.amazonaws.com/xujitezu/gekajamisagu.pdf
    • https://s3.amazonaws.com/vukusa/fitifawamatabedorowujat.pdf
    • https://s3.amazonaws.com/tuletivotarupu/15138522027.pdf
    • https://s3.amazonaws.com/tugabijenovili/pinixuzitomotiwene.pdf
    • https://s3.amazonaws.com/sazixipame/wacker_neuson_bh_65_parts_list.pdf
    • https://s3.amazonaws.com/pibajuwi/nilipenozajajoxedizubigu.pdf
    • http://mogorir.epizy.com/printable_school_bus_colouring_sheets.pdf
    • https://s3.amazonaws.com/pazovugal/lagu_brightside_lil_peep.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_off0000f042.bin
280318e78f56160219e773a4a56d2e189127802d4251dd747ba0b6f1ba066267		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF042 5212 bytes
font_01_sfnt_off0001021b.bin
934bcfc5d4c6875b6679b3576800691fb2dd1a09116d1f155b4c675edaa0532f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1021B 11428 bytes

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