Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e4bce36c302aa2…

MALICIOUS

PDF

65.7 KB Created: 2020-11-19 02:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 3a0db93383093ac78a0ee1532910991f SHA-1: d30350e721594eaa0d8696b1afedfe5932aae07d SHA-256: f1e4bce36c302aa2094d0c7b62c986931519dc1bcee7ec53773ad5dd877ea3d9
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-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.
  • 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://trafftec.ru/123?utm_term=best+manual+extension+cord+reel PDF link annotation
    • https://nulejekenafu.weebly.com/uploads/1/3/4/3/134367691/nuguz_boxebutafagajum.pdfIn PDF document text
    • https://jiwepurojal.weebly.com/uploads/1/3/0/7/130775762/7099023.pdfIn PDF document text
    • https://vubenazago.weebly.com/uploads/1/3/4/3/134357699/mebowogamokakolider.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/643267e886c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367004/normal_5fa196e85423a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371806/normal_5f924c02d885a.pdfIn PDF document text
    • https://ludexibof.weebly.com/uploads/1/3/4/6/134638297/845a240a586b0d0.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/5116.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484169/normal_5fb4884ee9b22.pdfIn PDF document text
    • https://dutajidadu.weebly.com/uploads/1/3/4/7/134730474/bb427ecff126227.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/4c05f4cb-bc07-4ce2-8ac1-9c4ec7000447/66390436720.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d289a020-16a0-41c9-b2b8-689aff536b56/xododunenizevoxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90ed1780-00b3-4e5a-b76e-c7351a9f5fb6/showbox_apk_for_kindle_fire_hd_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1431cdd-7178-482b-96d4-ba2378f61971/kelly_hallman_fireman.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_off0000c78e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC78E 5204 bytes
SHA-256: 3b6955ff9b206815cb900ecb3f37285ff62761191cb8dd2ce72d09d40fc4dff9
font_01_sfnt_off0000d929.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD929 9720 bytes
SHA-256: eb86d24597d95bfdab1e4d81e5b21fd3b22e4fd1555ee53fb62281b359746a73

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