Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7b7f93401e077e9…

MALICIOUS

PDF

72.2 KB Created: 2021-03-15 16:32:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 626fa2f5a310ffc90f45b11512942564 SHA-1: 3acaca7db829fbf34f4ea6c82bd60f0d87b7c980 SHA-256: d7b7f93401e077e958e7640e9b01ada35f82a284dbb504cf30ed81dae78c6767
194 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The presence of a 'download button' heuristic further supports the idea that the document is designed to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/123?utm_term=cabela%2527+s+adventure+camp+ps3 PDF link annotation
    • http://fidafevemikiwe.mywebcommunity.org/literacy_definition.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/2367332.pdfIn PDF document text
    • https://tazumeter.weebly.com/uploads/1/3/1/4/131438167/dagowagaseb.pdfIn PDF document text
    • http://bavimobuxadu.medianewsonline.com/bissell_power_steamer_heavy_duty_3-in-1_manual.pdfIn PDF document text
    • http://zudepogumo.medianewsonline.com/kalexasor.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/3594953f9db45.pdfIn PDF document text
    • http://dadujez.22web.org/the_raven_queen_cleric.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bekusisit.atwebpages.com/vijenarenuzozaxinamez.pdfIn PDF document text
    • http://biborufa.epizy.com/65780475243.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cd7f5c2-1824-432c-9fe7-1578eb99ced1/how_many_calories_in_a_whole_wheat_bagel_with_cream_cheese.pdfIn PDF document text
    • https://769966b8-4adc-437e-bba8-f198cf6e171b.filesusr.com/ugd/41a0b6_896ae009aae64640913697f81c9c9f6c.pdf?index=trueIn PDF document text
    • http://dexixikix.epizy.com/41191415716.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea7d5630-848d-4d14-a5c1-56c1f494bf9c/desa_specialty_products_5316-a_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/478b73e5-06e5-4804-a394-66a82b786c55/56616946509.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_27d458b76a974ac0a52a66f7cc486571.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f935569-b930-4f2e-ada9-06e158523af0/polaris_trail_boss_250_2_stroke_carburetor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14233dad-1b0d-4d4a-a61a-dc3a3b295f6e/how_much_money_do_diesel_mechanics_make_a_year.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d97490-8a9c-402e-9ee5-f9cbbe6376f7/basic_physics_a_self-teaching_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc9b68f9-35fb-4dec-9d63-1c89566058c3/is_the_odd_thomas_movie_on_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ccd3b1d7-28d3-4c77-bc46-0898a1079ddc/intuit_mint_hide_transactions.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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 5520 bytes
SHA-256: 79cefc4c52370994b018735c959c0049a77f6b2dd913ab227a13b5ad8425a364
font_01_sfnt_off0000ecfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECFA 11532 bytes
SHA-256: 1ba81b3ca1da2bfcb1f754eb0708107dd2d6bbb6bb3c54153603e1358a3abb8d