Malicious PDF — malware analysis report

Static analysis result for SHA-256 e852fc64dc7b8d23…

MALICIOUS

PDF

77.2 KB Created: 2021-03-18 03:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 65e27a5cfc5a0d2e20ba3964870b030a SHA-1: 61835ba9e7960837bb0cc6cf7026374be12e8af2 SHA-256: e852fc64dc7b8d2304520f20d6fed11512ea5f7da79372098007feb952b6d1bf
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, indicating a phishing or trojan distribution attempt. The document body, though heavily obfuscated, contains keywords like "zipper locks amazon" which, combined with numerous external links to disposable domains, suggests a lure to malicious websites. The presence of embedded URLs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM further support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/wix?keyword=zipper+locks+amazon PDF link annotation
    • http://newipufisatag.scienceontheweb.net/when_did_the_postal_service_begin_in_the_uk.pdfIn PDF document text
    • http://segwaywheelchair.ru/kukekofisezujuje74ubr.pdfIn PDF document text
    • http://naturebiolog.space/85060016440ivmui.pdfIn PDF document text
    • http://trynutra.shop/managing_projects_with_gnu_make_3rd_editionmpau1.pdfIn PDF document text
    • http://kidepokapila.22web.org/49034537994.pdfIn PDF document text
    • https://tololomajaju.weebly.com/uploads/1/3/4/4/134472688/memut.pdfIn PDF document text
    • http://mavito.online/what_is_the_function_of_the_oxygen_gas_required_in_aerobic_cellular_respirationlukmx.pdfIn PDF document text
    • http://pe50off.info/3229054046tkljs.pdfIn PDF document text
    • http://chebsvet.ru/97579664015hj306.pdfIn PDF document text
    • https://jixejuterekafiw.weebly.com/uploads/1/3/4/5/134508928/puxixudujoso.pdfIn PDF document text
    • http://kavesowotefa.iblogger.org/7_wonders_of_the_world_in_tamil.pdfIn PDF document text
    • http://dapurixid.sportsontheweb.net/98271035935.pdfIn PDF document text
    • http://max-lifting.store/classic_cars_for_sale_las_vegas_nevada1s1jp.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fubavinexazixo.onlinewebshop.net/biopsicologia_pinel.pdfIn PDF document text
    • http://rewuwuja.onlinewebshop.net/vonusupili.pdfIn PDF document text
    • http://faligesiba.rf.gd/vixewamupudamejivajixod.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE582 4860 bytes
SHA-256: fef438687c05163eccbfb43508a329e43143998a7077999e2d038c05015e75a2
font_01_sfnt_off0000f5e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E1 10568 bytes
SHA-256: 96904e858ed8a70f4a7a3964ba9786fb356d7dbfed15ad398adb6bb48925561e
font_02_sfnt_off000119fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119FD 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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