Malicious PDF — malware analysis report

Static analysis result for SHA-256 74e7e8d9e617c8da…

MALICIOUS

PDF

84.0 KB Created: 2021-02-16 12:28:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 8d74082ee7dd00f76e4121f66b8286ac SHA-1: 5e624219b72d2cd18da07c2601e5cfad0e845dec SHA-256: 74e7e8d9e617c8da01b3874b55a7ec96d58c44506fe0a027edb2105df680694f
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to 'Elizabeth k kbler-ross stages of grief model', likely to trick users into clicking the malicious links.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=elizabeth+k%25C3%25BCbler-ross+stages+of+grief+model In PDF document text
    • http://loxapul.iblogger.org/15271900113.pdfIn PDF document text
    • http://qwertyujg.xyz/6147732309410axv.pdfIn PDF document text
    • http://psychologyrelax.xyz/hcci_stock_reportp5efn.pdfIn PDF document text
    • http://esportzmlevent.com/mexamubisilogiwijr2aa0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452152/normal_5fcf8172ef0e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405946/normal_600fb072c9929.pdfIn PDF document text
    • http://3gusevshop.website/68874861532pwk9z.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422906/normal_60111ef62c9db.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471688/normal_5fd39d9f00c1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425933/normal_6007f45bce8eb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421464/normal_601ffd84090c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477163/normal_60263d9ae43ad.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://pewaxoxepizus.rf.gd/bench_press_program_template.pdfIn PDF document text
    • http://nupituf.epizy.com/gotivolulinoro.pdfIn PDF document text
    • http://liwubujuwu.epizy.com/wiremibuguzuna.pdfIn PDF document text
    • http://nekipusixewid.epizy.com/delta_table_saw_parts_36-725.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_off0000f9c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C6 5364 bytes
SHA-256: 889df910c97682f3463870a196907e06ce0379bbd43a9ef1964ce81355b6ec3b
font_01_sfnt_off00010c16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C16 11376 bytes
SHA-256: 96d5438be8bd422978edaffd08b13d416f9ed5de9bfa25165c375df34232d269
font_02_sfnt_off00013254.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13254 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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