Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4046112b5164bc9…

MALICIOUS

PDF

84.0 KB Created: 2021-03-12 19:01:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6cc2b63c31b683777bf88dfff5edbd16 SHA-1: 4eac3fe306fdf57aaec17090f97673427633754f SHA-256: c4046112b5164bc9acfd91ff99031377b2cf0c5e546c46c08b372dabb21355e1
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though partially garbled, suggests a pretext for reporting issues, likely to mask the malicious 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
  • 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://dafemum.ru/123?utm_term=reporting+deplorable+living+conditions In PDF document text
    • https://cdn-cms.f-static.net/uploads/4505326/normal_6041f9bf67d2b.pdfIn PDF document text
    • https://zezevibowavaki.weebly.com/uploads/1/3/4/8/134854125/jewup.pdfIn PDF document text
    • http://niludop.22web.org/fusidixaxowolasezobojeba.pdfIn PDF document text
    • https://fenuwobubejugud.weebly.com/uploads/1/3/1/4/131454420/letagurizulamon-robobumarenivib.pdfIn PDF document text
    • http://resokipuga.getenjoyment.net/gozigipugojakuroradanigi.pdfIn PDF document text
    • http://zoxodur.sportsontheweb.net/32452148041.pdfIn PDF document text
    • http://mazubume.22web.org/wusew.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/jobuwajuli.pdfIn PDF document text
    • http://bodaweziwov.mypressonline.com/daily_life_of_an_ancient_egyptian_pharaoh.pdfIn PDF document text
    • http://worelimupuvefam.mywebcommunity.org/the_monkey_king_3_hindi_download_kaise_kare.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392215/normal_5ff6b0c75befd.pdfIn PDF document text
    • http://kidiwutimako.mygamesonline.org/dieta_astringente_hospitalaria.pdfIn PDF document text
    • https://gamubojuteno.weebly.com/uploads/1/3/5/2/135299935/5201207.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tofujuwo.onlinewebshop.net/number_tracing_worksheets_for_kindergarten.pdfIn PDF document text
    • http://zasuwunal.myartsonline.com/87599938668.pdfIn PDF document text
    • http://febiked.rf.gd/97448613055.pdfIn PDF document text
    • http://rigirulame.epizy.com/xisevupekudemugixaxon.pdfIn PDF document text
    • http://rilokewatufev.rf.gd/fubukasenobelulomu.pdfIn PDF document text
    • http://budusujebosew.epizy.com/85103401773.pdfIn PDF document text
    • http://noxebujo.epizy.com/how_to_prepare_income_statement_in_excel.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_off00010c27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C27 5448 bytes
SHA-256: d5370e386c944d6a744def6c581a1d04ff79f203eff80dc7b8074281a4253644
font_01_sfnt_off00011ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EC3 10456 bytes
SHA-256: d42aa6b606a7eb51c8335437f1482158284cf592fb3ddf21cdd14bfaf87b86d2

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