Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac889b91d354d30a…

MALICIOUS

PDF

74.1 KB Created: 2021-03-25 07:31:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 64ffc8bc7e238e358ab99661fd4313d1 SHA-1: 1b3d38291c3ef92f673d785c65a1e8031e89663d SHA-256: ac889b91d354d30a01391b7687338b6be0e053460c64afadffc4ca9a8f5fc952
156 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 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 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://dugedepap.ru/123?utm_term=analytical+ability+test+with+answers+pdf PDF link annotation
    • http://vevovifox.scienceontheweb.net/befugari.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_603724e23244e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381104/normal_5ffd0098199cf.pdfIn PDF document text
    • http://xikisavi.scienceontheweb.net/guvar.pdfIn PDF document text
    • http://duzusedolatepe.mypressonline.com/telugu_alphabets_chart_with_hindi.pdfIn PDF document text
    • http://rabizepafuxonag.mypressonline.com/xixovuroburinuxab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489414/normal_60002661e7146.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_a5f7e362bae249dc837b8f6b36fff46d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fovezewi/resume_template_word_for_teacher.pdfIn PDF document text
    • https://0fdd9f25-8366-4660-9463-376fd915ad39.filesusr.com/ugd/c16cf9_359cf3f6451247b6b2efd86ffc9e1f89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/marks_standard_handbook_for_mechanical_engineers_12th_edition.pdfIn PDF document text
    • https://5d3a3edc-1384-4eb0-a354-174dd54c13aa.filesusr.com/ugd/7f5dc5_bc7eb90ca2aa43949084047de0da7601.pdf?index=trueIn PDF document text
    • https://1c019786-7048-4615-837a-ae53f087c4ae.filesusr.com/ugd/8b4172_d7315fd3c4274d9facda1d8cda730c28.pdf?index=trueIn PDF document text
    • https://d89a15f7-21b5-45f0-b9b4-bc5b7be68842.filesusr.com/ugd/18e821_adf9d3e0ae5a474f9520bb55635df8c9.pdf?index=trueIn PDF document text
    • https://0ad41a48-0d79-4d0c-b54d-a200151b25d4.filesusr.com/ugd/10b03a_722d0984b7c648a298f92235d65e9fd8.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/marimejerebo/59925662204.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/jeevan_labh_brochure.pdfIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/rexunudazekibidazul.pdfIn PDF document text
    • https://e5eb5b25-b33c-43e3-82d5-57ab1bf863d8.filesusr.com/ugd/b0c717_5e7f895b2249446390211c6af81e4991.pdf?index=trueIn 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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2DD 5568 bytes
SHA-256: 51dc221bc3266092587428486e4071a302e3b9545a85a4d0f302b7c4a5429f50
font_01_sfnt_off0000f5db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5DB 10492 bytes
SHA-256: 98749d23a57918fb95ec183e028d58efa3787a85a5c60b64fc51f5472c8583de

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