Malicious PDF — malware analysis report

Static analysis result for SHA-256 d31a1e5a808c2c89…

MALICIOUS

PDF

78.0 KB Created: 2021-03-03 22:27:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b1d0ba8096bcf0a7dd9e1ea6badf6442 SHA-1: a46ba31f7b73becd19016ccbe19d278ebfeba290 SHA-256: d31a1e5a808c2c89d844e23230c1925dcaa765ef2600e0effd2392cf38f206e1
126 Risk Score

Malware Insights

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

The PDF file is detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a review title, likely serving as a lure.

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://nipisod.ru/strik?utm_term=the+fault+in+our+stars+book+review+the+guardian PDF link annotation
    • https://cdn.sqhk.co/xulawajikigi/S7WuhGY/wewopanodurozegokajigi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480758/normal_6026f667313d9.pdfIn PDF document text
    • http://bratskpravojur.ru/siwizelavovabodabovigurydmu6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384644/normal_5fe8f25247ca1.pdfIn PDF document text
    • https://cdn.sqhk.co/torujazelome/jgihggh/pyramid_of_giza_mystery_solved.pdfIn PDF document text
    • http://help-nanny.site/age_of_empire_2_hd_freew0xi5.pdfIn PDF document text
    • http://cardioactiveitalia.site/hindi_guitar_songs_with_g_c_d_em_chords57mdn.pdfIn PDF document text
    • http://realwockyc.info/getawekunikiwovawizefakag3gqa9.pdfIn PDF document text
    • http://ovca.space/jijobewoderaxibanazifuxuvzv18.pdfIn PDF document text
    • https://cdn.sqhk.co/repudodo/jihcBjj/45301355672.pdfIn PDF document text
    • http://bigpleasure.ru/79557780391iqfsd.pdfIn PDF document text
    • https://cdn.sqhk.co/xulawajikigi/jgiduA8/cheap_prescription_contacts_for_astigmatism.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466154/normal_6008cc5294c25.pdfIn PDF document text
    • http://iminn.ru/39513839225i5o2j.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/novipaliwid/31439419834.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_off0000f3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3B9 5476 bytes
SHA-256: a79ef76c39e3fb33108d0f8cdb4a66d9674011bd90bc954476cf2333fcc2a2c2
font_01_sfnt_off00010665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10665 10660 bytes
SHA-256: af046b968e453ede34cf371110e70988caa1a5583bd95fb402df9c355328d971

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