Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e4ddceb68057f96…

MALICIOUS

PDF

77.7 KB Created: 2021-04-02 16:54:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c4d51961c282ec166bfbf2cdb28fc11a SHA-1: d095d56a15d4a24b95cd88d2fdb419cce8a5d428 SHA-256: 2e4ddceb68057f96d5a384121cb2497af5a37f4b35955408e22ac45550b8134d
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with 30 distinct URLs found. One URL, https://dafemum.ru/award?keyword=alimentos+transgenicos+beneficios+pdf, is identified as a malicious redirector. The document's structure and link farm suggest it is part of a phishing or scam campaign designed to lead users to malicious sites. No scripts were extracted, but the presence of numerous links and the malicious redirector strongly indicate a phishing attempt.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/award?keyword=alimentos+transgenicos+beneficios+pdf In PDF document text
    • https://cdn.sqhk.co/nenoserod/JjcieAc/40165068307.pdfIn PDF document text
    • https://vutubazedo.weebly.com/uploads/1/3/2/7/132740780/1240683.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/Lhj7boq/disney_emoji_blitz_events_sept_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/bejomewuv/3iggdsE/vitopamikufef.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxuzobisu/8jdUSut/application_of_smart_materials_in_civil_engineering_ppt.pdfIn PDF document text
    • https://cdn.sqhk.co/rokatodupi/gdhjchh/mcb_atm_card_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/kibedutej/jcttiil/world_bricklaying_championships_2019.pdfIn PDF document text
    • https://kotedeturu.weebly.com/uploads/1/3/1/6/131606402/7376410.pdfIn PDF document text
    • https://cdn.sqhk.co/kufagilan/jhjfzge/caravan_park_management_jobs.pdfIn PDF document text
    • https://cdn.sqhk.co/nojedajoze/7iaIhWh/digi_honeycomb_login.pdfIn PDF document text
    • https://ruvedusipokowu.weebly.com/uploads/1/3/0/8/130813644/0e42b8.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/haXii9C/translate_english_to_spanish_app_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/lapitobexeva/Mpb7jf8/zujugi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95043331-d9de-4498-ad98-35b8ac3ee23f.filesusr.com/ugd/5740b2_c9fb2353ae884144943ec1bccf8b2951.pdf?index=trueIn PDF document text
    • https://da550aaf-34ae-4f9b-ad82-7836b82beebe.filesusr.com/ugd/a203e6_7c60abe7234f4bf49afb715d321ed868.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7de7dd0a-cf54-4ac6-a5a3-6715d0529753/polaris_side_by_side_150cc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/da1fc170-3e28-49c7-9117-0d4c4224d03e/70098475668.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f667a8b8-10d1-423c-ace2-0e7b2626dcff/bedazuzoromarazoged.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc24b200-980f-4f1a-81e4-c9befaeb46cc/pazesezub.pdfIn PDF document text
    • https://dd3528e8-ded0-4753-843e-0d3cb9f542e7.filesusr.com/ugd/4d6844_cac67b9ee6354919830bf8c9b71fa0e3.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_off0000ee1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE1E 5604 bytes
SHA-256: d324273c9666a36c2e83e0c9e03092b487f3939dfd164a40e2c286aa1c2a7506
font_01_sfnt_off00010112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10112 11744 bytes
SHA-256: 6ba0f6b04ef0f8255af7b4893b9916e199aa12e5014481294a63631678b73407