Malicious PDF — malware analysis report

Static analysis result for SHA-256 6268ad8d9299d5d9…

MALICIOUS

PDF

77.7 KB Created: 2021-02-17 10:51:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: bed1858c648bf17ab63db9d90c3f50f0 SHA-1: 58f594d3d59b7bcd31d53cb270459d13d483b0ed SHA-256: 6268ad8d9299d5d9b7d130c9d58c1fd8128abb545502efbbdf40df4ae28c5e8e
204 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, with a critical heuristic identifying a link to known malicious redirector infrastructure. The document's structure and the presence of many links on disposable hosting suggest a link farm designed to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF format itself can embed JavaScript, which could be used to facilitate these redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • PRC/3D content in PDF medium CVE related PDF_PRC_3D
    PDF contains PRC 3D content. PRC/U3D parsers have been a recurring Adobe Reader attack surface; treat as a related parser-exploit indicator rather than a specific CVE match.
  • 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 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/123?utm_term=navy+dental+corps+special+pays In PDF document text
    • https://cdn-cms.f-static.net/uploads/4418001/normal_6022db1f44d89.pdfIn PDF document text
    • https://cdn.sqhk.co/fugolamudara/hihig8a/mituvokesuk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412890/normal_601f99649c353.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4467577/normal_5feb6c014ea88.pdfIn PDF document text
    • https://cdn.sqhk.co/sadoburola/hjughNF/bkash_app_cash_out_charge.pdfIn PDF document text
    • https://cdn.sqhk.co/zururodi/iiWjhii/80675859917.pdfIn PDF document text
    • https://cdn.sqhk.co/vuvupewog/kPjvheV/renuwixozejogu.pdfIn PDF document text
    • https://cdn.sqhk.co/vadezewe/eEijbhh/runescape_old_school_quest_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487424/normal_5fcae5116b629.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
    • https://s3.amazonaws.com/dojonuta/tamabademiwopirer.pdfIn PDF document text
    • http://kulitetokap.epizy.com/xezukazesegipop.pdfIn PDF document text
    • http://gafomawonerif.rf.gd/athbutha_deep_malayalam_full_movie.pdfIn PDF document text
    • http://jojudodadanu.epizy.com/master_promissory_note_template.pdfIn PDF document text
    • http://jelugubafegoj.rf.gd/no_country_for_old_men_book.pdfIn PDF document text
    • http://kogosez.epizy.com/types_of_interest_groups_icivics_worksheet_answers.pdfIn PDF document text
    • http://lunofalogejutu.epizy.com/lotebuf.pdfIn PDF document text
    • http://pamerugug.epizy.com/illegal_unreported_and_unregulated_fishing_enforcement_act.pdfIn PDF document text
    • http://vakakumiwizexoj.epizy.com/xojir.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_off0000e68e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE68E 4984 bytes
SHA-256: d3d826293046c0380cbf2bf1fbbea97746e1b5d18f953a06d668fec4d7f99467
font_01_sfnt_off0000f795.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF795 10464 bytes
SHA-256: 552d428516fc5f152f335a89bea24cb217a9e390a1a4567a2de4590ae315ebd7
font_02_sfnt_off00011b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B27 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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