Malicious PDF — malware analysis report

Static analysis result for SHA-256 482908a26d16e333…

MALICIOUS

PDF

67.5 KB Created: 2021-02-01 14:40:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1df95dc3c6be9b1a3f9bc7a426afd7b2 SHA-1: 22790b76f1a86a73e08c0c4ecbded93656b28fe6 SHA-256: 482908a26d16e3330c0a717d22ab2f2b4e370d11c0a13eb47c9ed749ee9089ab
126 Risk Score

Malware Insights

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

The PDF file contains multiple external URIs, with one specifically pointing to a URL that includes 'calculus+single+variable+6th+edition+pdf' in its query parameters. This suggests a lure to trick users into downloading malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates a malicious intent to distribute content via disposable hosting. ClamAV detection as 'Pdf.Phishing.Trojan' confirms the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/123?utm_term=calculus+single+variable+6th+edition+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4409000/normal_5fc762581de4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446395/normal_6015c0a6649ab.pdfIn PDF document text
    • https://cdn.sqhk.co/vedasukuki/ghfigjb/retrograde_september_2020_virgo.pdfIn PDF document text
    • https://cdn.sqhk.co/dezorevukor/idDjbjc/oxenfree_gameplay_length.pdfIn PDF document text
    • https://cdn.sqhk.co/wekonexiw/4Wehdhe/zikuzowe.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/rJigXgd/45463070365.pdfIn PDF document text
    • https://cdn.sqhk.co/rixazezozo/B8iaiic/3488984347.pdfIn PDF document text
    • https://cdn.sqhk.co/kimejijomaki/7Byf3DS/descargar_gooz._io_hackeado.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385880/normal_5fd330d834417.pdfIn PDF document text
    • https://cdn.sqhk.co/repipedifavi/hbJlJif/jorifuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bujetazufukuv.rf.gd/birthday_songs_punjabi.pdfIn PDF document text
    • https://s3.amazonaws.com/vofadoloves/b._ed_application_form_2019_mp.pdfIn PDF document text
    • http://wajiletum.epizy.com/tik_tok_video_without_watermark.pdfIn PDF document text
    • https://s3.amazonaws.com/pululusodogi/labefi.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/32168258500.pdfIn PDF document text
    • http://fukutinupamebo.rf.gd/10830114534.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/zaneromuk.pdfIn PDF document text
    • https://s3.amazonaws.com/bufexa/69495770315.pdfIn PDF document text
    • http://retesatitogeli.epizy.com/propiedades_del_achiote.pdfIn PDF document text
    • https://s3.amazonaws.com/zomuzigo/envato_market_templates_html.pdfIn PDF document text
    • https://s3.amazonaws.com/dojonuta/71229133305.pdfIn PDF document text
    • https://s3.amazonaws.com/gonasidupij/75978888195.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_off0000c880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC880 5676 bytes
SHA-256: 9ec85f951f6bad8cc6601a36d648a6ee23bb743e7bc753317a966270fb4ff719
font_01_sfnt_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 10848 bytes
SHA-256: ad2ba9d9bde8ce3feaee2644271645c9ed429879055e2f3bd04ae2c08ba1a549

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