Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4cb40dfc789f816…

MALICIOUS

PDF

71.3 KB Created: 2021-03-09 15:43:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2bea8064c7b8a9cc21d88075d027b5f6 SHA-1: d312383b899d0906e2d39fc2e574d27d7010b583 SHA-256: a4cb40dfc789f816825bf1d02aa1cafbe182d1fe20b0872aba8e5c2bf16270a7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://mezovuduw.ru/123?utm_term=divinycell+foam+core+sheets PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4385197/normal_5ff696ba5220a.pdfIn PDF document text
    • http://lnstagramverificationbadge.com/81054749901ict3j.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_5fe7ab3df3513.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/hjgsjb7/pazadalorusolejubedasod.pdfIn PDF document text
    • http://instapriz365.online/67842549347car8r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417206/normal_5fc6a0b09a70c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479223/normal_5fcc29af93c48.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378161/normal_604186a8c8442.pdfIn PDF document text
    • http://car-den.ru/youre_ugly_too_lorrie_moorercdsj.pdfIn PDF document text
    • http://gazawadowig.22web.org/nawimox.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373248/normal_6029c69bb7c28.pdfIn PDF document text
    • http://antonioit.fun/49132293717vafzp.pdfIn PDF document text
    • https://cdn.sqhk.co/rexazileka/hcibUgc/51505627935.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/hatuuc8/aadukalam_video_songs_hd.pdfIn PDF document text
    • http://iwhite.space/business_english_vocabulary_test3t699.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e3f67bd-77c7-4304-9b08-f86b39ae4524/excellent_words_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c562208-0bcd-4d5b-8f14-87f522033295/47716329139.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bee94b36-47c0-4e46-ad5c-15d1774d7de9/mitiremiwibaputolofiko.pdfIn PDF document text
    • http://feribejelabini.rf.gd/ninja_blender_instructions_auto_iq.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb20b315-737d-4785-81a4-333592032e21/nuxobuzarisotaferugatomow.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_off0000da09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA09 5284 bytes
SHA-256: d766403935f8ffe30037d805cf36dbdbaaf2944b00c6ddab4f38472f7b39726a
font_01_sfnt_off0000ebeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBEB 10720 bytes
SHA-256: d27eae4c160c5624088223bb52c98213c8a83079dcc628e177a7806b5ed25228

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