Malicious PDF — malware analysis report

Static analysis result for SHA-256 16e2969291a9f1bb…

MALICIOUS

PDF

83.7 KB Created: 2021-04-01 13:20:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 095e0ce3e27ec88499aa9a0b2a0f246a SHA-1: 185887449098fa26995233cf5b05b54f210b3e14 SHA-256: 16e2969291a9f1bb7a59a4463d4f3f4ff319c98c3b6cf604886dd2dce6e8d836
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, with ClamAV detecting it as a phishing trojan. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious sites. The embedded URLs and the document's structure indicate an attempt to disguise malicious activity as legitimate content, likely leading to further exploitation or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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 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://druttle.ru/wix?keyword=halley%2527s+bible+handbook+kjv+pdf PDF link annotation
    • https://cdn.sqhk.co/noneniwetav/fDqhdid/cake_decorator_job_profile.pdfIn PDF document text
    • http://nakekizedexu.getenjoyment.net/what_to_do_if_you_fail_pre_employment_drug_test.pdfIn PDF document text
    • https://lizakefamejoxen.weebly.com/uploads/1/3/1/3/131384135/ff67523a61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419235/normal_5fcd835e78be9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425929/normal_604b7bc7432db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369504/normal_5fc839b1ad8ff.pdfIn PDF document text
    • http://nasty666.space/canada_food_guide_servings_milkratjs.pdfIn PDF document text
    • http://xasedogamif.mypressonline.com/cabot__noi_employees_credit_union_routing_number.pdfIn PDF document text
    • https://gavixidosoxadi.weebly.com/uploads/1/3/0/7/130776067/1080613.pdfIn PDF document text
    • http://kompledom.com/85833698612kziyp.pdfIn PDF document text
    • http://opensalle.xyz/739384624574qv8e.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/aQoGjfy/king_kong_kicks_facebook.pdfIn PDF document text
    • https://cdn.sqhk.co/duwenaxiseve/ciejchi/zombie_hunter_survive_the_undead_mod_apk.pdfIn PDF document text
    • https://vexikolilugurud.weebly.com/uploads/1/3/1/3/131379290/b5267d892a.pdfIn PDF document text
    • https://fogolaliri.weebly.com/uploads/1/3/2/8/132814342/safenil.pdfIn PDF document text
    • http://busurman.space/bsf_leave_application_form8cbgc.pdfIn PDF document text
    • https://xilamebi.weebly.com/uploads/1/3/4/5/134598653/8152f967.pdfIn PDF document text
    • http://gosunenibunale.getenjoyment.net/taxujawux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_249ab2a0a79c409ca3df362273fc41bd.pdf?index=trueIn PDF document text
    • https://3e1ae61b-6b68-46dc-8a90-d1c7a5b9f91c.filesusr.com/ugd/b8bbd7_0e10e64188b04155a6432d0daf6f0d46.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_c6c46a2bf6c745b7b4dc5ffe32926165.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_7c171d7fe2734bed85c0500e494375db.pdf?index=trueIn PDF document text
    • https://297de083-771a-4730-a3b8-a2afe8c7d209.filesusr.com/ugd/47424f_2e5166a9346f41fca06c360d91da6a74.pdf?index=trueIn 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_off000107a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107A4 5468 bytes
SHA-256: 24e5affcfb29ca3c016e42d8afdcb85e8f16e582de001b3a616a5080f5eb3344
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 10940 bytes
SHA-256: 63b322e14bf61d524cc99a96eeeadc8937bba9b1e27d45c8b0c5d6aac79ae49b