Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87204c35dc8122a…

MALICIOUS

PDF

77.2 KB Created: 2021-03-20 09:16:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 8efa3322a01a5a756af5a6a86aaace76 SHA-1: 24980e76a811eeedd9f4cf2361903fc29bae0626 SHA-256: e87204c35dc8122a2ed97b37468a2a3148f713afe298b531055e494b8d7ef03d
186 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, and exhibits characteristics of a PDF link farm. It contains numerous external links, with several pointing to disposable hosting and potentially malicious domains. The presence of PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics strongly suggests a malicious intent to manipulate search engine results or redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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.
  • 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://jacksth.ru/strik?utm_term=what+are+the+three+primary+data+gathering+methods PDF link annotation
    • https://telapawuwa.weebly.com/uploads/1/3/5/9/135964826/3327340.pdfIn PDF document text
    • https://lixuzagaleve.weebly.com/uploads/1/3/0/9/130969249/vibikiko_pajela_jabeti.pdfIn PDF document text
    • http://smartycredit.info/how_do_i_use_my_mac_computer_for_beginnersfaabw.pdfIn PDF document text
    • http://worldhold.online/rewemafefuzatawabumaneyv9s0.pdfIn PDF document text
    • https://funogumoduwe.weebly.com/uploads/1/3/4/3/134309977/4055eab9.pdfIn PDF document text
    • http://podarokinsta24.online/rufositaridpnx6a.pdfIn PDF document text
    • https://xunumiselodaz.weebly.com/uploads/1/3/0/7/130775676/acc635cf458332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_b60bb6dfa31f46f0afa5d51fa112e7f9.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4acd3250-d2fe-496a-8ff8-a199bbdf6e6c/94854681981.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7ee65d2-e8f8-42f6-a0b6-df12a691876c/what_settings_do_i_use_for_night_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/133cdd18-635e-4028-ac48-451712b82ef2/dumesaforenuzerovifezaga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23f98e92-5b96-4c6c-ac3b-3bb0c6ef639a/modernist_cuisine_images.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ee63f9d6-beb6-420f-8f7c-fb037cb00b82/32423800418.pdfIn PDF document text
    • https://57933e30-1e86-4cbe-ad2b-777cb72f9932.filesusr.com/ugd/235f1a_c53d35aa6d514bb9a5c0a7ac9a3ad135.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/90646d3d-4d57-41cb-8969-2f4d3a8cea48/what_does_stock_market_college_do.pdfIn PDF document text
    • https://932aa67c-856a-4fda-9fc8-fe3f50d4acc2.filesusr.com/ugd/a25eee_0d337cb115e74f1dbd172418f34a0b9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xedewofuretujo/halo_mythos_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b08e7c71-ef78-4144-8b64-61e68deafbdd/folimutugupoguku.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/review_samsung_galaxy_a10e_s102dl.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_off0000f006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF006 5456 bytes
SHA-256: 98ed7b2bee26067b953d57f86232f67bbaa44f278a6bf2a24d9126adcca858c5
font_01_sfnt_off0001027e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1027E 10352 bytes
SHA-256: a100626d3c54725c5252366f611e413427943a003505212e4fd87143aba3767b