Malicious PDF — malware analysis report

Static analysis result for SHA-256 312c53a85e4e8f0e…

MALICIOUS

PDF

88.2 KB Created: 2021-03-12 09:31:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: e0a1e853b58c2142748b02d2ff7e6ee1 SHA-1: 4eda709db18096331e4f80c38da65fd79884fda4 SHA-256: 312c53a85e4e8f0e79f47c1dc9c7efc010ab951832e95236454df691e4446098
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly suggest malicious intent, specifically classified as phishing. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://kuzutuzo.ru/award?keyword=arqueologia+procesual+pdf PDF link annotation
    • http://zokoxakabu.medianewsonline.com/66262864308.pdfIn PDF document text
    • http://fineagencyy.com/miwojonisagolm6bzz.pdfIn PDF document text
    • http://mukinumatonewo.getenjoyment.net/xurez.pdfIn PDF document text
    • http://homeolimp.com/mercury_outboard_service_manual_indexo17xl.pdfIn PDF document text
    • http://fubikopelemom.mypressonline.com/side_by_side_1.pdfIn PDF document text
    • http://mnclassis.org/bihar_board_12th_model_paper_20200wawo.pdfIn PDF document text
    • http://uk-delfin.ru/garmin_forerunner_405_replacement_band_velcro2h4b0.pdfIn PDF document text
    • http://slmit.space/950876734934kh77.pdfIn PDF document text
    • http://tehnotop.site/13266537713b5luy.pdfIn PDF document text
    • http://ukrinsure.com/81153369123lh29o.pdfIn PDF document text
    • http://hellesypakk.online/fovafokohy44d.pdfIn PDF document text
    • http://circleshtang.xyz/how_to_start_a_new_paragraph_in_excel0oopl.pdfIn PDF document text
    • http://microbestdigitalmeter.xyz/vb.net_tutorials_youtubez9z2d.pdfIn PDF document text
    • http://notdull-eng.online/shield_hero_light_novel_19tkjzb.pdfIn PDF document text
    • http://googsnat.space/celebration_of_life_template_publisher20hb3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4d25fb6-605d-4046-8b75-43dd2cdada83/juwutibepa.pdfIn PDF document text
    • http://roworozirad.epizy.com/prove_absolute_value_properties.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/377221cb-dc8c-4d91-af3d-e09135275559/songs_of_praise_top_10_christmas_carols_2020.pdfIn PDF document text
    • http://fonosatal.epizy.com/42880314814.pdfIn PDF document text
    • http://fanurumuge.epizy.com/wunuzelekupafugut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11aafefc-f058-4ba5-80c5-9886efdeb471/bijafaxapifa.pdfIn PDF document text
    • http://lawigut.rf.gd/xanuj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0231fbdd-03ac-49ba-9504-3a19af95f28f/webuzakeluxevewamud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c9d4c77-c05d-4c12-81a4-eb8e79d1f2ba/napep.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_off00011de8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE8 5440 bytes
SHA-256: cc9d7d270415f80c6cf8579f4f37ed02cbee585b58408b8599df59ff7f48baf3
font_01_sfnt_off0001306f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1306F 10196 bytes
SHA-256: 350e4ad284e9da0137de07e4b4b72c15721432cfc3aca309254bd497f9501c95

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