Malicious PDF — malware analysis report

Static analysis result for SHA-256 2fd9d3a026563f86…

MALICIOUS

PDF

61.6 KB Created: 2020-12-07 11:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 23d9b57961b4bdb946004af97cf701ba SHA-1: 98527a10571ba2472c051e61e0f47459ab09bf5f SHA-256: 2fd9d3a026563f8618c4d7d9000b9a453f602a2d6898f1dbebd0f7faa0736608
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 0.9996

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://trafftec.ru/strik?utm_term=graphing+quadratic+functions+in+standard+form+worksheet+algebra+2 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4414680/normal_5fbb5c0fe3bac.pdfIn PDF document text
    • https://barobinamad.weebly.com/uploads/1/3/4/7/134756413/0c422.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417652/normal_5f9d96b880c41.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416919/normal_5fb4fb9e4757d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/kavitokolezub/cards_against_muggles_espaol.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/nepali_national_anthem_audio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83089f1-9f68-4152-9996-e5f1e6655267/section_123_of_the_prescription_act.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457bd67a-6811-40d9-b180-6f615abc6968/53621432697.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/78334033611.pdfIn PDF document text
    • https://s3.amazonaws.com/zaxawetawupo/39723250504.pdfIn PDF document text
    • https://s3.amazonaws.com/zasepo/nigerian_chichewa_movies.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe1eafba-d5ad-43f9-babd-f380ff73f862/80151378074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0e850dd-7094-427a-afbf-a5114cfafda0/fun_run_3_hack_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/gomaxod/main_idea_ereading_worksheets_robots.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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 6156 bytes
SHA-256: 2ec2ea31713a037e70176cdd73ec4e27759e7050334851936b407e6237266521
font_01_sfnt_off0000c5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5FD 10244 bytes
SHA-256: 9328ff549e985dfc5b13cc9119df5d33e120c56c80f81f2f1c4a8628c01d82dd

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