Malicious PDF — malware analysis report

Static analysis result for SHA-256 c244b8fbe406e3d2…

MALICIOUS

PDF

80.1 KB Created: 2021-04-28 17:56:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 7fe90709935d31be944a41182df15030 SHA-1: 422add1a6eac976bc357470b12414ded70f50357 SHA-256: c244b8fbe406e3d20a4aca11bc2249ae4fd62de062db0d0d126e0f33627edc48
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The primary URL, https://mezovuduw.ru/strik?utm_term=call+of+duty+cold+war+beta, is presented as a lure related to a popular video game. While no scripts were explicitly extracted, the PDF structure and numerous external links indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://mezovuduw.ru/strik?utm_term=call+of+duty+cold+war+beta PDF link annotation
    • http://autobuff.xyz/vipujuzujera000zy.pdfIn PDF document text
    • http://hh666o.site/4845140534e35ot.pdfIn PDF document text
    • http://seplafond.xyz/what_is_the_blue_book_value_of_a_2014_ford_escape7f26o.pdfIn PDF document text
    • http://reawont.online/nimavozotumodbdr0.pdfIn PDF document text
    • http://infokurs.design/head_first_java_2nd_edition_source_codexkl2e.pdfIn PDF document text
    • http://afracheat8.xyz/juleteneuj2js.pdfIn PDF document text
    • http://pedalini.club/jepoxuraxavolurivixalolcfjdb.pdfIn PDF document text
    • http://helplnstagramcontact6088758.com/nefedujofapututq9cg.pdfIn PDF document text
    • http://consequences.space/240953264mth3p.pdfIn PDF document text
    • http://reestr.site/the_opposite_of_loneliness_marina_keegan_summaryrcn8l.pdfIn PDF document text
    • http://egrn-order.online/elac_debut_series6seuz.pdfIn PDF document text
    • http://groby-ritual.online/sidipasafobenogobive2orph.pdfIn PDF document text
    • http://dirtygirl.fun/734543896251fz8g.pdfIn PDF document text
    • http://hairsprof.ru/29736841405elclv.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9eff4bf0-55a5-42b9-a65a-250f23c32afd.filesusr.com/ugd/80978b_a5d5db8c9640476391a194aa6aa02af3.pdf?index=trueIn PDF document text
    • https://6762652a-e869-40f3-960d-1446d4066230.filesusr.com/ugd/55e6b1_42b456f0974446bd8c81609a3ee6349a.pdf?index=trueIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_f399211425f242c787c3452d87c1202e.pdf?index=trueIn PDF document text
    • https://2ac56fc1-f7ee-4366-9cb2-1681469c68ee.filesusr.com/ugd/b914b5_a630e0ad19d04e63a4ced74e4ce765f1.pdf?index=trueIn PDF document text
    • https://6e345194-e688-4037-aa24-2ff230a16836.filesusr.com/ugd/ce9fe1_df0e8e65729b4042940d702a11471dd2.pdf?index=trueIn PDF document text
    • https://ec5c17a1-061e-4a2c-a9e6-b3561ba71229.filesusr.com/ugd/299074_b4f409063a8b4e7d8836088bac18cd3e.pdf?index=trueIn PDF document text
    • https://ca483b97-61ac-4196-bca0-6b249c18eca9.filesusr.com/ugd/b27199_71327e893e2c401fb1824ea79c41e098.pdf?index=trueIn PDF document text
    • https://d6ac5066-27fc-4e71-a07d-b30af50dfe8b.filesusr.com/ugd/934fc3_be8cd720b76f483fb8ded8d39a9939d5.pdf?index=trueIn PDF document text
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_3eec9a64b30648bc8f15f161bfb9e333.pdf?index=trueIn PDF document text
    • https://8dfd47f4-e591-4377-92a3-bdbf91d41e5a.filesusr.com/ugd/a58b01_f7f141b8d1804de4b82c4e842909e548.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_off0000fafa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAFA 5076 bytes
SHA-256: 9dd98ce0661c051afa5e825a82d9ef6367bce58d9033b2773fccf55873d784b4
font_01_sfnt_off00010c66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C66 11516 bytes
SHA-256: 6deaef27d981ceab245d449f96b8260adea5232e56f7f402e012a321aa4704cd