Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c88626dc17f66c6…

MALICIOUS

PDF

69.5 KB Created: 2021-02-24 12:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: a45700e71feabffa4630d86b0156435b SHA-1: 15300b0cafc63c145c19dce401ed3903314dfe33 SHA-256: 0c88626dc17f66c63c5fbb5c975d2b3ef32353db92da729b3e1b5c817209d022
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs, suggesting it functions as a link farm or phishing lure. The presence of external URIs and a link farm heuristic points towards an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/wb?keyword=dr%20king%20letter%20from%20birmingham%20jail%20essay PDF link annotation
    • https://cdn.sqhk.co/gasalikuviz/cniaL6i/light_it_up_like_dynamite_lyrics_bts.pdfIn PDF document text
    • https://sexeduju.weebly.com/uploads/1/3/5/3/135327292/d8eac7f51b.pdfIn PDF document text
    • https://kibopomirisusi.weebly.com/uploads/1/3/2/7/132741064/tesasurubipoki.pdfIn PDF document text
    • https://cdn.sqhk.co/vunelebu/OHjihe1/metal_bear_pack_fortnite.pdfIn PDF document text
    • https://kofasarafafe.weebly.com/uploads/1/3/5/3/135390193/bubovenonixugu.pdfIn PDF document text
    • https://cdn.sqhk.co/bapisolel/lBN7hgC/demuv.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/purumorigabikuxelobur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_602f279bc88df.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495055/normal_60023e948179e.pdfIn PDF document text
    • http://nubuweso.iblogger.org/bsqueda_de_informacin_y_privacidad_de_informacin.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/77608892399.pdfIn PDF document text
    • http://wubijati.epizy.com/45299143305.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/54388145592.pdfIn PDF document text
    • https://s3.amazonaws.com/gupojakami/revenue_canada_forms_rental_income.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_off0000d300.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD300 5564 bytes
SHA-256: d7fc27456d316030d311df752ac75918bf678753f3d22d15bfa7153cf9fa64b5
font_01_sfnt_off0000e5d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5D9 10196 bytes
SHA-256: ad363681e3ce03832c660199a1274a7fcb276bcd45f9c292669093df9ee59bc5

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