Malicious PDF — malware analysis report

Static analysis result for SHA-256 6721eed3c919cf40…

MALICIOUS

PDF

83.1 KB Created: 2021-05-16 02:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 166db71841d42501c3fbaf5d2de1eaa3 SHA-1: d428a1de700ce9667036af795231f07d282a967a SHA-256: 6721eed3c919cf40b0090f967200cc1cb158f33d559def2a41a317c5a2c21b07
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a high likelihood of this document being used for phishing or malware distribution by redirecting users to malicious sites. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML detection strongly suggest a malicious intent to redirect users to a compromised or malicious resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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/strik?utm_term=python+pandas+tutorial+with+examples PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474176/normal_6008d3d791a6a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5ffac7cd1bf47.pdfIn PDF document text
    • http://stepka2016.xyz/how_to_pair_bluedio_t4_turbine_headphonesr9h94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450733/normal_5fdc477e461b1.pdfIn PDF document text
    • http://instapriz365.site/judazutafesnmxj.pdfIn PDF document text
    • https://bemixujigimo.weebly.com/uploads/1/3/0/9/130969474/noworogaxosag.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408343/normal_5fc67b21930ff.pdfIn PDF document text
    • http://fufirewavit.getenjoyment.net/uppababy_vista_v2_2020_colors.pdfIn PDF document text
    • https://mubafuzolifuben.weebly.com/uploads/1/3/4/6/134644730/bda10dbdd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468530/normal_601a386acccba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415304/normal_604ce6cb67330.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_6053b4ba5c441.pdfIn PDF document text
    • http://astrohelp.space/gekitoxojusabiwizelakenxrrow.pdfIn PDF document text
    • http://hayatevesigar.online/what_is_the_american_criminal_justice_systemjz32i.pdfIn PDF document text
    • https://zawobulogu.weebly.com/uploads/1/3/1/0/131070044/rilunub_josuw_fujojojafitijed.pdfIn PDF document text
    • https://rujuzodojavumip.weebly.com/uploads/1/3/4/7/134726220/lazufaged.pdfIn PDF document text
    • http://dusibarupuguli.medianewsonline.com/vonetabuj.pdfIn PDF document text
    • https://duzareledibasa.weebly.com/uploads/1/3/4/8/134890493/1465614.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454303/normal_6052ad07b3709.pdfIn PDF document text
    • http://zumepaposakuf.scienceontheweb.net/puzimikogejuritiwopubibo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388420/normal_6062a4e83c7e3.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://tudafaketewud.rf.gd/kexojamuw.pdfIn PDF document text
    • http://lutepebenunara.rf.gd/95522909207.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE60 5344 bytes
SHA-256: 8ca59d1b0c996f958d7450558d9304625f8edba04010e1ee13c52bc5bd48373f
font_01_sfnt_off00010069.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10069 11384 bytes
SHA-256: a0ded7f4cea4512482cb8c24626a17a74ab27299dc152d808f069900e09c5f12
font_02_sfnt_off0001276d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378
font_03_sfnt_off00013520.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13520 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff