Malicious PDF — malware analysis report

Static analysis result for SHA-256 d99322236f60264d…

MALICIOUS

PDF

141.2 KB Created: 2021-02-12 09:16:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 653882d636879564d4270ff938c075b7 SHA-1: d660b59a7029a346716ce7b39175a2dc8c4576e7 SHA-256: d99322236f60264ddd899ffe884cd665ff17418a06eb89ee5a71a93fcefa35e5
126 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm on disposable hosting, designed to redirect users to external URLs. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://baarspo.ru/123?utm_term=how+to+make+a+candle+wick+without+borax PDF link annotation
    • https://cdn.sqhk.co/sativomofij/ejcggDf/48875311153.pdfIn PDF document text
    • http://natiral.space/film_khasi_jeff7bxib.pdfIn PDF document text
    • http://fishland.store/blush_pink_dress_formaljwjqf.pdfIn PDF document text
    • https://cdn.sqhk.co/lejesapazud/ij7jj1I/79733834467.pdfIn PDF document text
    • http://baby-slings.ru/rap_lyrics_clean_freestylemmtxd.pdfIn PDF document text
    • https://sovonasu.weebly.com/uploads/1/3/1/4/131407222/pozubovibosozum.pdfIn PDF document text
    • https://cdn.sqhk.co/bifoligi/Eibhbhi/ripijisebuxodizubosove.pdfIn PDF document text
    • http://detonic-ro.website/77556093923lh9to.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/iiijZid/pidonulizafetokax.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wedizakur.epizy.com/69797853065.pdfIn PDF document text
    • https://s3.amazonaws.com/dogazisuze/1146684305.pdfIn PDF document text
    • http://zelekisiwamab.rf.gd/xikomor.pdfIn PDF document text
    • https://s3.amazonaws.com/dagasopones/7728482297.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/alzheimer_s_society_factsheets_driving.pdfIn PDF document text
    • http://dewelimu.epizy.com/management_consulting_industry_reports.pdfIn PDF document text
    • https://s3.amazonaws.com/zunaduxa/android_activity_lifecycle_explained.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001cce6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CCE6 5324 bytes
SHA-256: a4d89137964973eedcf1045327eff0be997608efa06c10002b36605bd526cc85
font_01_sfnt_off0001ded7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DED7 2032 bytes
SHA-256: 7cd63ea236a3a6d34ee5cfcf5f2ed40bd3c4c6d914ea15b4ac01f3e62163efdc
font_02_sfnt_off0001e867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E867 12268 bytes
SHA-256: 3e69e74c837b70562a174bb3d5ab570259b7bc5c83beb798517c32b75806b701
font_03_sfnt_off0002102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2102C 16492 bytes
SHA-256: 83f5cc6c91650386463628b40c53d4c74dd6a95ea54055c128ae36355e0b7c8e

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