Malicious PDF — malware analysis report

Static analysis result for SHA-256 20afd125d3971506…

MALICIOUS

PDF

78.0 KB Created: 2021-04-05 06:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: a74e744258f1e12f5c32bb595f2920f9 SHA-1: edd3c67d4ca3f9240f7aa26a497ec9422f84d71e SHA-256: 20afd125d3971506ebbd6e84ee05ec1c09a7e68f0674eb4d468e3f10e77f6a91
126 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm or redirection mechanism to host malicious content. The presence of external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong intent to distribute malware through deceptive links, likely as a spearphishing attachment.

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://botokaw.ru/wix?keyword=instron+bluehill+3+user+manual PDF link annotation
    • http://zopokujejisolan.getenjoyment.net/song_of_solomon_chapter_10_prezi.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/61995726448.pdfIn PDF document text
    • https://detabifaf.weebly.com/uploads/1/3/1/4/131436978/87c9f82f8.pdfIn PDF document text
    • https://cdn.sqhk.co/nivabetaz/iLvfuyg/zizesa.pdfIn PDF document text
    • https://robugagemo.weebly.com/uploads/1/3/5/3/135304688/3632053830.pdfIn PDF document text
    • https://cdn.sqhk.co/zasokolof/he1oe5A/30780631440.pdfIn PDF document text
    • http://kadanijojabuf.mywebcommunity.org/multiplication_drill_worksheets.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/veraxawewib/yamaha_motif_xf8_harga.pdfIn PDF document text
    • http://lowevuribif.epizy.com/61271346766.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b42d561-7484-46cd-b337-3f0f0e52600f/22111746714.pdfIn PDF document text
    • http://ziwivazud.onlinewebshop.net/98994954057.pdfIn PDF document text
    • http://zipulosi.atwebpages.com/rokup.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/arthur_c_clarke_the_sentinel.pdfIn PDF document text
    • http://fupaxanido.rf.gd/32517048393.pdfIn PDF document text
    • http://xugejaf.rf.gd/how_to_compare_and_contrast_literature_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f17bc8dd-c709-4a94-88e1-004357b8e500/what_comes_after_percy_jackson_and_the_last_olympian.pdfIn PDF document text
    • https://s3.amazonaws.com/bakoloj/nulikake.pdfIn PDF document text
    • http://rovafitazilom.epizy.com/canarios_sheet_music.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_off0000f40c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40C 5168 bytes
SHA-256: 4668dc60f1b360de82909e122c854e599f137116055a5d4bb02bd5be9d10a822
font_01_sfnt_off0001056e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1056E 11432 bytes
SHA-256: 94d2f5a1eb5538af6fd117a73bf2284dcd437d0632a20728a5aab0fe5cb865ae

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