Malicious PDF — malware analysis report

Static analysis result for SHA-256 3c09ac679a662942…

MALICIOUS

PDF

77.0 KB Created: 2020-11-14 18:01:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: d535eb2eebd8105323eceffd3a0878de SHA-1: d7d8ffb853b2c502249f6bf2a50c59113f2299c0 SHA-256: 3c09ac679a6629426b39f59d1a99f83735dafbe24e274b0366b167daae4cf659
214 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 and routes users through malicious redirector infrastructure. 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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://gettraff.ru/123?utm_term=casio+sa-76+power+adapter In PDF document text
    • https://bulipabuwalo.weebly.com/uploads/1/3/4/1/134131868/mosaz_bukonimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485828/normal_5faac9edac618.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376606/normal_5f97eb8f5ce31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417137/normal_5fa51d8b347f4.pdfIn PDF document text
    • https://wozogerodinanu.weebly.com/uploads/1/3/4/4/134498855/1eb435d0924856.pdfIn PDF document text
    • https://taferirufip.weebly.com/uploads/1/3/4/5/134582969/2883147.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/41c3b38a-f39b-4661-a882-0b57fa4c48e6/goririvebasugozalodejupo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57dfef0f-32c3-47b8-ac07-8194768ff35b/61828818166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ef3dc1-cd24-4512-b0f9-5d3eb2114540/sorizotosonowobalukozobal.pdfIn PDF document text
    • https://s3.amazonaws.com/wogikokuzotaxa/list_of_words_with_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7e5876a-5a39-4b20-9ac2-502f294b784c/9483213114.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000fa4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFA4E 26192 bytes
SHA-256: 3ac7ace8a56ce6b13845c5518a6037fd5820ef4e9cc972d6f3445b1e180a1e2a
font_00_sfnt_off0000c492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC492 5184 bytes
SHA-256: 3b4cf378beb8b8839fa7cb45375aff6f1796ee2817160d76ff3876cb764c2ee3
font_01_sfnt_off0000d65a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD65A 10432 bytes
SHA-256: 901045b779023edd6ca2ccf0c36e34ddea3cc27aaceef140b8aac5f8d39d792e

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