Malicious PDF — malware analysis report

Static analysis result for SHA-256 ce1239488ad15a10…

MALICIOUS

PDF

122.1 KB Created: 2021-04-01 23:36:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8d05b730aa99171961c6e4132e6d8fb6 SHA-1: eb4d1caf112e6a16967599ccd35c889b69cf8b88 SHA-256: ce1239488ad15a10c22ad75eb27b1e83ce7798dc62d0cb493b68ce7552fbaad6
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicative of a link farm or SEO spamming operation. ClamAV and ML heuristics identify it as a phishing or malicious PDF. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=south+park+fractured+but+whole+parents+guide
    • http://dithetsen.xyz/what_are_the_five_elements_of_an_argumentyc2uh.pdf
    • https://static.s123-cdn-static.com/uploads/4476930/normal_5ffcccb85cee8.pdf
    • https://cdn-cms.f-static.net/uploads/4486563/normal_60252914b4a84.pdf
    • https://dolepaxutafajur.weebly.com/uploads/1/3/0/9/130969408/xolemeviwij-josoxafa-bemet-nivodorikebozaz.pdf
    • http://lynciguest.com/favadukapogolad1zhfc.pdf
    • https://xitapazutirubej.weebly.com/uploads/1/3/4/8/134882608/8417400.pdf
    • https://jaxikagiwuzeno.weebly.com/uploads/1/3/4/6/134698588/2786682.pdf
    • http://xagixowedobosab.medianewsonline.com/zaluguwelopebezufabuvozeb.pdf
    • https://morutasatosode.weebly.com/uploads/1/3/4/3/134366393/laraliduwif.pdf
    • http://meetsoda.pro/66574369076grh7o.pdf
    • https://bifotuvimutojuz.weebly.com/uploads/1/3/0/9/130969437/7093328.pdf
    • https://wizisenax.weebly.com/uploads/1/3/4/3/134320615/zananexet.pdf
    • http://operationhomeplate.com/baermann_adagio_clarinetb5d1k.pdf
    • https://saniluje.weebly.com/uploads/1/3/4/3/134323688/nunipenire.pdf
    • http://apsdd54gfv.xyz/mais_all_star_football_game_2019_live_streamjxh6f.pdf
    • https://zunarorukozem.weebly.com/uploads/1/3/4/0/134016655/wilegoles.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fa9c9145-2854-4df2-ba53-5443437c4781/focusrite_saffire_pro_40_firewire_audio_interface.pdf
    • https://uploads.strikinglycdn.com/files/5a9e3fa5-aa02-43a5-9071-86257f6408d2/stock_market_live_stream_game_app.pdf
    • http://kigokigaruv.myartsonline.com/sonda_vesical_intermitente.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_off00019cdd.bin
41f5e291c349a457edfc0d990ac251a7a27e33608124b18ff92d7e295735ee80		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19CDD 5816 bytes
font_01_sfnt_off0001b0b0.bin
c6958394ad49d0b22fa32423550859c0267c318f51d90136252276cb4a026778		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1B0B0 11768 bytes

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