Malicious PDF — malware analysis report

Static analysis result for SHA-256 36b99e0b3273938f…

MALICIOUS

PDF

73.0 KB Created: 2021-03-25 18:35:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 95a82b36fccdd2c53816cd642e1656df SHA-1: b2e0527a222b7e2260ded637ab080f7c2c5ce0ca SHA-256: 36b99e0b3273938f6c66eaa0bb8a0ed1aa668dbb6c4a2577f0dd1b5e4c8dee06
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable hosting services, indicating a link farm designed to obscure malicious destinations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ClamAV detection 'Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0' strongly suggest a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be a lure related to a medical dictionary, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/award?keyword=oxford+concise+medical+dictionary+pdf
    • https://fulidozemupure.weebly.com/uploads/1/3/1/3/131384797/1d6fc6b0c860dd3.pdf
    • https://tivafalaxemi.weebly.com/uploads/1/3/0/7/130775521/4ce7baeec9.pdf
    • http://suziterunedoloj.sportsontheweb.net/semonixowukugifomel.pdf
    • https://wivewuti.weebly.com/uploads/1/3/4/6/134698804/5057998.pdf
    • http://punavuvipufov.sportsontheweb.net/60946175398.pdf
    • http://koxivesuvif.mypressonline.com/tolifobegexuz.pdf
    • http://sudejiw.22web.org/fexovuparamo.pdf
    • http://felesatediz.medianewsonline.com/vergilius_aeneas_destan.pdf
    • http://fezatubiwe.getenjoyment.net/19725216175.pdf
    • http://fawopomowuri.iblogger.org/69662955277.pdf
    • https://gadudomarun.weebly.com/uploads/1/3/4/7/134705140/6230830.pdf
    • http://ruregere.sportsontheweb.net/53793483532.pdf
    • https://pexagizim.weebly.com/uploads/1/3/0/9/130969673/metofane.pdf
    • http://gejokakop.mygamesonline.org/42946739078.pdf
    • http://palubofapejuraw.mywebcommunity.org/le_libralisme_communautaire.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://torasimi.rf.gd/73836907074.pdf
    • http://nofelututuxop.epizy.com/nazorukij.pdf
    • http://bokapiwupepox.rf.gd/babuputu.pdf
    • http://wovibojo.onlinewebshop.net/do_varied_carpet_beetles_have_wings.pdf
    • http://genenapukiral.epizy.com/zubawixozivanojipu.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_off0000deb9.bin
7725527daa77ef9a7dc1835667390cdb75e24505ae4ddf62faad31d97eb969a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB9 5496 bytes
font_01_sfnt_off0000f162.bin
264230096486c6ab4d08c9a6a07dbacbab8ac9699a2d8beda8d834d74f9f437c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 11584 bytes

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