Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d4d0e94952f857f…

MALICIOUS

PDF

76.0 KB Created: 2021-03-31 04:21:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1b5683390542607d794d15ad17616b00 SHA-1: b08e62ba98cfb153c8b50e48f5ae5be8a189d344 SHA-256: 7d4d0e94952f857fb6531dc3ae3e09b74abce227d2fd05fb478ae3cbaa7602c7
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://bologen.ru/award?keyword=livestock+and+poultry+management+pdf+agrimoon PDF link annotation
    • http://ses-sanobrabotka.ru/pezugetisavelukexejakegurqb9d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460243/normal_5ff25d7a2dd08.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386597/normal_604040d7e2004.pdfIn PDF document text
    • https://sagizebuwajap.weebly.com/uploads/1/3/1/4/131437005/bufikogomexewa.pdfIn PDF document text
    • https://logesili.weebly.com/uploads/1/3/5/3/135389335/7c1fe.pdfIn PDF document text
    • http://roskycnmx.com/vasijufixodobopokajj3zjh.pdfIn PDF document text
    • https://vofitusu.weebly.com/uploads/1/3/5/3/135301199/073e18a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385850/normal_6042e2e2ec92e.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/7100680.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nedajazamofo.epizy.com/gomofududelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2215b26a-5cf1-441e-a657-5c55555aed94/dell_inspiron_2350_power_cord.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/131978f4-e7ee-44c0-a053-89967e3bd31d/why_classical_period_called_the_age_of_reason_and_enlightenment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a905b7d-c4b7-4776-a6c6-fb104505c11c/when_will_i_receive_my_1099_form_from_social_security.pdfIn PDF document text
    • http://xutarefes.epizy.com/fitumizaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/972619ff-6688-40b4-9b60-1d8a8bb18498/what_vegetables_can_be_cooked_in_an_air_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6cb3c73-e1a8-4c9e-87bd-ab8de98a1060/emma_jane_austen_characters_movie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91187113-916e-4ff0-a4f2-eb26ec7a2103/hydrological_cycle_worksheet_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76d15872-4936-4dd9-933f-18087361be9d/kung_fury_2015_imdb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a8a8f6b-d6f1-4654-b34a-f5b6275c47a8/91269642803.pdfIn PDF document text
    • http://jabafujadopus.rf.gd/widikuzideduwikozaxeset.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_off0000e819.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE819 5640 bytes
SHA-256: 451134024653804e334982a7c9df6d9487bdb4e9daa82df3d8501bb89fbaefbb
font_01_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 11036 bytes
SHA-256: 8aea503d484b71a2cd589606d3d9873c1e88427ae1cadfabd491793ce5ea7e1b

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