Malicious PDF — malware analysis report

Static analysis result for SHA-256 e430786c8aedd98c…

MALICIOUS

PDF

72.8 KB Created: 2021-06-02 16:29:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: b884613fc1d02e12be28d27051898456 SHA-1: c76ced46c8bda392492bc0aa2ddda414d9ab8c45 SHA-256: e430786c8aedd98c9bb2eeea3bfc908366d4bc31e0d69c9aa5d09b948365dc6e
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 0.9997

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://ketchas.ru/pbw?utm_term=singham+d%25C3%25B6n%25C3%25BCyor+t%25C3%25BCrk%25C3%25A7e+dublaj+izle+full+hd PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4406466/normal_5fe4e0943a093.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4482426/normal_60b4bea6f2138.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383314/normal_5fe98cfce5734.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366973/normal_6067bffd3bfa2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449766/normal_6016c50ee9a36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461505/normal_601b19958d4b3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4413978/normal_60b1bdc59d5e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489716/normal_5feb26a81b660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482424/normal_60336250dd201.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454052/normal_5ff1cf9d27361.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gediripu.pbworks.com/f/what_is_serology_testing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e4e9a6e-5a16-4592-9172-ec385cf28fca/what_can_i_do_about_parental_alienation.pdfIn PDF document text
    • http://famukaser.pbworks.com/w/file/fetch/144423780/xerevesigudazegaw.pdfIn PDF document text
    • http://liguduper.pbworks.com/w/file/fetch/144452562/licencias_para_eset_nod32_antivirus_2021_marzo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f9b12139-3131-4294-a6b4-ce4b94ffb158/fairy_tail_magic_brawl_codes_may_2021.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144411963/58717030802.pdfIn PDF document text
    • http://pilujibos.pbworks.com/w/file/fetch/144492033/6876485445.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/w/file/fetch/144493731/96684038209.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_off0000d183.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD183 6120 bytes
SHA-256: 80b617676287a036a4629d2b7681dbdebd28f21053a56d95f816f1dc9bba8b79
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 15204 bytes
SHA-256: 9bdfbb88a0594214c817b06594b1e19447bc626ff53584ab0932252022cec238

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