Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8c65bcfae9b409…

MALICIOUS

PDF

75.6 KB Created: 2021-03-30 06:42:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bdf60a67a690a13d8dcfbe335a15f1d3 SHA-1: 5ece69aebf26262424dd6f54dded69fd838e2335 SHA-256: 8b8c65bcfae9b4097357eaae28cf84e3a40f670f43f7b0a0e3f646a0a7f24412
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and one directly linked to a search query for a broken appliance. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or a scam. No scripts were extracted, but the presence of many external links suggests the document's primary purpose is to redirect the user to a malicious site.

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://jacksth.ru/strik?utm_term=kenmore+elite+stove+top+not+working
    • http://gudutisiluzew.mypressonline.com/calendario_escolar_2020_panama.pdf
    • http://serovakarara.mygamesonline.org/9750795948.pdf
    • http://xegazinijitup.mywebcommunity.org/aa_meetings_raleigh_saturday.pdf
    • http://kokolonesafu.getenjoyment.net/kipunipasikeba.pdf
    • http://mujoxoluvisukid.getenjoyment.net/kiwegigopixetuxajanen.pdf
    • http://zujugowez.iblogger.org/amore_liquido_bauman_download.pdf
    • http://tiwimifozukimu.medianewsonline.com/business_case_study_template.pdf
    • http://vebilodugisugod.iblogger.org/28800522708.pdf
    • http://fajamad.mypressonline.com/24073389941.pdf
    • http://zozitaze.mypressonline.com/nefezafidizelujobukaw.pdf
    • http://niwizonoleror.mywebcommunity.org/37179776699.pdf
    • http://dapajurop.mygamesonline.org/washington_football_schedule_2020.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5e45b90-0226-4f63-a54f-4ddc5a15023d/how_to_recline_graco_stroller.pdf
    • http://mavuginogafesu.epizy.com/zadojarujimere.pdf
    • https://uploads.strikinglycdn.com/files/10613083-8a9b-4eef-8bb4-5f3b9beda7f0/jepulepejejenel.pdf
    • http://zaxuzut.atwebpages.com/mathematical_apocrypha.pdf
    • http://kepofif.onlinewebshop.net/57814182464.pdf
    • https://s3.amazonaws.com/belapawerezuju/31992675239.pdf
    • http://kivabidugitu.rf.gd/panasonic_fz2000_vs_fz1000_ii.pdf
    • https://s3.amazonaws.com/vawoginele/67298884998.pdf
    • http://sokekakeloji.onlinewebshop.net/lexuvobalewudebafeku.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_off0000e8cd.bin
2ee3175c48bac68db66915ffc92194cffb6edfe5e1fa6a2a9ed8da4a24fc43f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CD 5112 bytes
font_01_sfnt_off0000fa3a.bin
02aa119d6fe1ab99874c7a1f6a4de85ee1307d6fb10d53873f7baa219f2895f5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3A 11464 bytes

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