Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e103111a8839e1…

MALICIOUS

PDF

78.3 KB Created: 2021-02-03 07:08:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4ff18f59d1a352261186a22550213503 SHA-1: 2fd0838393a26fa6e3a88ef7153bf9753b295c8c SHA-256: 38e103111a8839e148f6a3f8b5b00dca50c197fa37f4cb128a49bc2b0cddf373
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDF files, suggesting a link farm or a distribution mechanism for malicious content. The ClamAV detection and ML classifier strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a phishing or malware delivery attempt, likely using embedded JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://crophysi.ru/123?utm_term=figurative+language+identify+it+worksheet+answers PDF link annotation
    • http://good-production9.site/jasmine_richardson_new_identity_20175eapc.pdfIn PDF document text
    • http://storeplus.info/cinderella_song_dilly_dilly_free6b3e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fce351c22af6.pdfIn PDF document text
    • https://jevezorubik.weebly.com/uploads/1/3/4/8/134864628/sanejakuruw-wejanumogetiwiw.pdfIn PDF document text
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/f6c338875480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462096/normal_5fd9376ddd464.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371790/normal_600274579426c.pdfIn PDF document text
    • http://dsv-trening.ru/sonicwall_nsa_240_hard_resetd3mov.pdfIn PDF document text
    • https://warexuzema.weebly.com/uploads/1/3/4/6/134601764/tasefofasa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408873/normal_5fff7847e9d2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490272/normal_5fdd5a20e4b1d.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/vibuvomomuv/movasevuweno.pdfIn PDF document text
    • https://s3.amazonaws.com/xozeb/vakil.pdfIn PDF document text
    • http://luvojidepezepag.epizy.com/1683130605.pdfIn PDF document text
    • http://jipowefata.epizy.com/systemic_lupus_erythematosus.pdfIn PDF document text
    • https://s3.amazonaws.com/dojivewobasuval/camelot_tv_series_episode_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gogunabones/26345541944.pdfIn PDF document text
    • https://s3.amazonaws.com/jifedefujodu/27522171440.pdfIn PDF document text
    • http://duxurulokij.epizy.com/social_media_monthly_calendar_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/4102585239.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/canon_in_d_piano_sheet_chords.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/developer_android_google_maps.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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5444 bytes
SHA-256: f1b09548fd61eb602ea1b38a8e891c077a2e613e71784edb25626ed9c93142c9
font_01_sfnt_off00010649.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10649 10832 bytes
SHA-256: 4d7b7cdacdb9512d3487c17ad5b0a3fa7d404815abcba00932aa4c2d3d4152f4

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