Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e10b37afb50e625…

MALICIOUS

PDF

83.4 KB Created: 2021-03-13 21:12:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db1ac31d2fb18127d3c7f63e8c7b912e SHA-1: 756a1b3c96a25a98260941dad72c854c9611ed96 SHA-256: 1e10b37afb50e6251e8abd8bffa57e88162c2da746f85b36eb91f671dec316ef
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with at least one pointing to a suspicious domain ('jacksth.ru') that is likely part of a phishing lure. The presence of multiple links and the use of 'utm_term' parameters suggest an attempt to track user engagement with potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/strik?utm_term=easy+brandy+alexander+pie
    • http://biweekamnf.com/gixijitatel441h.pdf
    • http://tojuvapemupo.mywebcommunity.org/fibudixixesemofo.pdf
    • http://card2card-perevod24.site/xajigfwtrz.pdf
    • http://pakirekugep.scienceontheweb.net/bosenaximelugujirofot.pdf
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/govaw_nakeve.pdf
    • http://zomolejefej.mywebcommunity.org/gedabaledenaxezubobakek.pdf
    • https://dopapixe.weebly.com/uploads/1/3/1/3/131383645/powipenenegovad.pdf
    • http://organic100.fun/86537273177w1a7l.pdf
    • http://nowukusox.mypressonline.com/bilateral_investment_treaty.pdf
    • http://apparently-home.com/25661849447oqxg6.pdf
    • http://pagavopalubutu.scienceontheweb.net/frigidaire_dishwasher_reset_timer.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/c029000e-b5cb-43bd-a9ce-d8315a881f0a/what_kind_of_lattes_does_dunkin_donuts_have.pdf
    • https://s3.amazonaws.com/jitimesolagun/witalapuve.pdf
    • http://vujapoguxesak.myartsonline.com/nenozonireferozedonanewi.pdf
    • https://s3.amazonaws.com/wutogugej/davis_drug_guide_free.pdf
    • https://uploads.strikinglycdn.com/files/595941ca-7c45-43ea-8650-59d1a40e31fb/sapirutif.pdf
    • https://s3.amazonaws.com/wutogugej/potekovenumamevenuvutomid.pdf
    • http://muluwokixo.onlinewebshop.net/pifig.pdf
    • https://uploads.strikinglycdn.com/files/5c68cb7d-f8bc-4902-b9be-4bdc30732681/65483094492.pdf
    • http://bigapenegig.atwebpages.com/56942226533.pdf
    • https://s3.amazonaws.com/xukirizugukugi/xobid.pdf
    • http://davinawoguzag.atwebpages.com/85326304475.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_off0000fb63.bin
4fe17d20ca4634e0a1ac346ac352fbe4ce1607400b07fe4019d68ad3bbbdd26b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 4816 bytes
font_01_sfnt_off00010bbd.bin
2fa062955f247621a48954d39dcc8ee9ee72d3069296592fdbc06cf9b2706a0d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10BBD 11848 bytes
font_02_sfnt_off00013261.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13261 4324 bytes

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