Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb704ec65ac26d3…

MALICIOUS

PDF

70.6 KB Created: 2021-03-27 20:03:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: cd8dc54217759208e4d127082f2731ab SHA-1: 2a0101090cfd3b04359bd947297300a2c5116226 SHA-256: fbb704ec65ac26d3e4856695ad0184f7d5daafd4d9f0bd9a54a93ef4fb0b960c
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and is flagged by ClamAV as Pdf.Phishing.Trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, suggesting a malicious intent to redirect users. The document body, though heavily obfuscated, contains text related to "Mala absorci\[o]n intestinal pdf", which is likely a lure to disguise the malicious nature of the links.

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 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://jumiwimov.ru/123?utm_term=mala+absorci%25C3%25B3n+intestinal+pdf PDF link annotation
    • https://cdn.sqhk.co/komagiju/mkhoian/dejukepejozedekebolilolar.pdfIn PDF document text
    • http://vodabutopidaru.getenjoyment.net/61449896826.pdfIn PDF document text
    • http://tazidufobosefi.iblogger.org/35979100997.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/oBMMcYz/ford_mustang_2018_automatic_or_manual.pdfIn PDF document text
    • https://cdn.sqhk.co/vawapisoxe/aTjijdN/first_aid_for_burn_blister_on_finger.pdfIn PDF document text
    • https://cdn.sqhk.co/nexetifosam/fFgquie/jefabevajetujadexatufabe.pdfIn PDF document text
    • http://botavubapisod.mywebcommunity.org/graphic_design_bangla_tutorial_free_download.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/61409528013.pdfIn PDF document text
    • http://bezerojiw.scienceontheweb.net/brother_louie_piano.pdfIn PDF document text
    • http://zakosemej.mypressonline.com/41643798659.pdfIn PDF document text
    • https://cdn.sqhk.co/wukikanas/hdFeczm/duwoxukebekin.pdfIn PDF document text
    • https://cdn.sqhk.co/vumivatuvi/chjjcia/26572971072.pdfIn PDF document text
    • http://gejokakop.mygamesonline.org/top_1000_corporations_in_the_philippines_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/engineering_drawing_software_free.pdfIn PDF document text
    • http://gemovimuwopete.atwebpages.com/25550237497.pdfIn PDF document text
    • http://lonesopuw.onlinewebshop.net/wujigemilikomixewulewi.pdfIn PDF document text
    • http://jizokotasaz.rf.gd/bmw_e90_2010_service_reset.pdfIn PDF document text
    • http://xurebebin.epizy.com/anthem_discussion_questions.pdfIn PDF document text
    • https://s3.amazonaws.com/batoragubukepo/violin_solo_canon_in_d_sheet_music.pdfIn PDF document text
    • http://muvemaxadal.onlinewebshop.net/43035439142.pdfIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4DF 5432 bytes
SHA-256: 29d38a16afe22e63122100be2da2147866673f28a6464708c4c86d49c06b1d5c
font_01_sfnt_off0000e72c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE72C 11204 bytes
SHA-256: d7a8efbe27cfbeac7e271f85d82ce012244bac3c8051a34d0ff10a7a7f6002d3

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