Malicious PDF — malware analysis report

Static analysis result for SHA-256 0816c54bf2307dd7…

MALICIOUS

PDF

67.8 KB Created: 2021-06-10 06:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: be03901d8b8d2047f4dd5e409db83eb9 SHA-1: b1f0eb576892ce2b53b250a67e95945c7465e7e2 SHA-256: 0816c54bf2307dd7b2232bf752324bbf85bdfed83a0a118b2223a2665330ffce
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://dugedepap.ru/123?utm_term=columbus+day+math+worksheets+free PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4375083/normal_5fe7f72638a01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419828/normal_605fef418466a.pdfIn PDF document text
    • https://xumejiti.weebly.com/uploads/1/3/4/5/134529375/3722091.pdfIn PDF document text
    • https://kenomipijisax.weebly.com/uploads/1/3/3/9/133986884/a91d93f9bc56e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496816/normal_601689c88dae2.pdfIn PDF document text
    • https://govasosu.weebly.com/uploads/1/3/4/5/134519533/38cd3ce9.pdfIn PDF document text
    • https://webejalabedag.weebly.com/uploads/1/3/7/5/137518867/folelororepudalejoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500001/normal_6043911434db5.pdfIn PDF document text
    • https://zagidesurazobu.weebly.com/uploads/1/3/7/5/137507983/nakame.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420238/normal_60b98f2cb5511.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465555/normal_602a3019d4735.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/9a050f8f-f0e6-4756-b930-0031316d855f/beats_solo_2_wireless_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d49fc7d-fcf7-4d58-8dc3-6fe30b2d2d2f/lurupatimadepesudono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c88ee76d-d96c-4548-8c79-6cda0c66d6db/52128019253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61469988-9861-49db-b24d-c86c46817517/2525171531.pdfIn PDF document text
    • http://depowota.pbworks.com/w/file/fetch/144707280/rutesobafag.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddf29622-7ec0-4d64-b52a-7f5151bd345f/volume_of_a_prism_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06fc41f4-17be-49ea-b8ae-26c3d3c1dded/ez_go_textron_golf_cart_battery_diagram.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144656328/rowizatijixonajemu.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_off0000ca79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA79 5448 bytes
SHA-256: 355f300ad9583e65dcdf1005d782401142fe1ad8dfb5d7bd115f125d8b1c60cc
font_01_sfnt_off0000dce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCE0 10840 bytes
SHA-256: 5c08a6c357339fc5897586dcb002cf17662c1f5b63104acc59fa301445bab2a6

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