Malicious PDF — malware analysis report

Static analysis result for SHA-256 befb8728fdb650fd…

MALICIOUS

PDF

82.9 KB Created: 2021-03-21 09:15:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 38034dd9f1019b453d6cfe386805f0d9 SHA-1: 237c06964645f4dc9f7370d15afd323e56bf6f6b SHA-256: befb8728fdb650fdaff7d2a56e3b457614614d23dfc3d9060d8f9ae976abfab0
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent. The document's structure suggests it's designed as a link farm to distribute malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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://yafferge.ru/wix?keyword=nba+playoff+schedule+2020+tv In PDF document text
    • https://cdn.sqhk.co/tamoravuwera/jdRhaSW/grass_mower_service.pdfIn PDF document text
    • https://cdn.sqhk.co/bobimugura/ZlgfXcU/hidden_object_games_for_android_without_ads.pdfIn PDF document text
    • https://cdn.sqhk.co/puxedimuwo/7TWrjdZ/pavurov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fe90444f1ee9.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/e1gcaja/nuxadomikiwim.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466657/normal_601255cb11b36.pdfIn PDF document text
    • https://cdn.sqhk.co/felolavap/qhggggj/87801003113.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383568/normal_605455a27d363.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470960/normal_604627ab1d659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477156/normal_5fd2746dee18a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480591/normal_600013f001a3d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461516/normal_5ff0f5350c88e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://xofuzugavup.epizy.com/marine_biology_textbook_high_school.pdfIn PDF document text
    • http://jeburam.epizy.com/fuzemuveridizigopusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ef93aa6-294d-46f2-b57e-639cac76cecf/69360430261.pdfIn PDF document text
    • http://lekafedi.epizy.com/senior_network_administrator_interview_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a794a58f-b1c7-4836-af29-42b4a113ade8/lifenujexekawedomezozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ade2ecb-8739-4505-bbe6-11fe8e15874c/how_many_pages_are_in_diary_of_an_awesome_friendly_kid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6934370f-209f-4ce6-b7c4-58b76561d5aa/17742988721.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abbc030-c368-4764-919f-4b3f4ffd8c69/adding_and_subtracting_mixed_numbers_worksheet.pdfIn PDF document text
    • http://wezojepodi.rf.gd/zapeji.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f561.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF561 5420 bytes
SHA-256: 6eccff66b933ec94ccb637612fe0b63bb3bca87c6d92b0ef4d9e6d2d8cd70953
font_01_sfnt_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 12012 bytes
SHA-256: d8020eaa4bf6a19d308a5a11599cbf3b9a98e8ad9d65bc5a78cfebabb0186b5b
font_02_sfnt_off00013072.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13072 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2