Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cdc8ea1c9c36f29…

MALICIOUS

PDF

76.3 KB Created: 2021-03-11 09:04:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 28c8d102d2fa60e86cdd0f8545ba1aa6 SHA-1: 91f3f12e289cf0c53e58adc50128e2c74ca52036 SHA-256: 4cdc8ea1c9c36f29c541999eda02f802970133e24dabab947b6bc838a33eb8c0
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 6

  • 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.
  • 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://jumiwimov.ru/123?utm_term=stratiform+chromite+deposits PDF link annotation
    • https://vizedaxitexoter.weebly.com/uploads/1/3/4/7/134740617/050b8.pdfIn PDF document text
    • http://dumanejixaw.66ghz.com/vigul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475577/normal_5fd76e6f64c08.pdfIn PDF document text
    • http://socialwave.me/look_back_meme_funnyabtvv.pdfIn PDF document text
    • https://romugazasemagop.weebly.com/uploads/1/3/4/8/134897733/fizixakezenuta.pdfIn PDF document text
    • http://hotita.space/66146319770btrob.pdfIn PDF document text
    • http://bazunujovi.scienceontheweb.net/is_the_mortal_instruments_city_of_bones_on_hulu.pdfIn PDF document text
    • https://foxevavudutis.weebly.com/uploads/1/3/4/3/134380199/1100152.pdfIn PDF document text
    • http://mefogava.iblogger.org/xunofepebiwekefofuvu.pdfIn PDF document text
    • https://wajovojov.weebly.com/uploads/1/3/4/6/134652085/metopa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411717/normal_5fcf18ec89729.pdfIn PDF document text
    • https://metiwefipit.weebly.com/uploads/1/3/1/4/131406934/jiton_zivopebikoku.pdfIn PDF document text
    • http://cheapestshop.xyz/15925399477g61a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366995/normal_6019f903849e0.pdfIn PDF document text
    • https://niwanuve.weebly.com/uploads/1/3/1/4/131406473/legigoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vifidumefitur.atwebpages.com/varicella_zoster_adalah.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 5148 bytes
SHA-256: 02e15ce38950d83ea064b2edcc303a599e4eec49c373caf67bd5e61a3c6672f9
font_01_sfnt_off0000f15b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF15B 10676 bytes
SHA-256: 4b0636987438de1365211dbb20ee7c6086ebbb46c320af53a5ef019613ee4eba
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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