Malicious PDF — malware analysis report

Static analysis result for SHA-256 84077eb012769682…

MALICIOUS

PDF

78.4 KB Created: 2021-03-15 02:44:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 08bb022252911b407ac8c8d0550f8a0d SHA-1: 5b38b258d5e36f61e8bc77d6a69a1aed11b34f10 SHA-256: 84077eb012769682b071a9792a66643b91465fd128c8d9c02b3feba9628c6983
186 Risk Score

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 0.9992

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://dafemum.ru/wix?keyword=real+analysis+questions+and+answers+pdf PDF link annotation
    • https://bejeselujolir.weebly.com/uploads/1/3/1/3/131379719/597952.pdfIn PDF document text
    • https://satisetuxa.weebly.com/uploads/1/3/0/8/130813646/xibefigufoxur.pdfIn PDF document text
    • https://gijenufojuli.weebly.com/uploads/1/3/5/3/135335104/a6d1b.pdfIn PDF document text
    • https://pobufulali.weebly.com/uploads/1/3/4/4/134494274/e6f3814c51.pdfIn PDF document text
    • http://sbrf.link/6060808209384hi4.pdfIn PDF document text
    • https://lezafopiga.weebly.com/uploads/1/3/4/6/134628758/2463495.pdfIn PDF document text
    • http://verifybadgesbusiness.com/gozovuponoma1ci7a.pdfIn PDF document text
    • https://zadevadetolilug.weebly.com/uploads/1/3/5/3/135321342/sinakexinuko.pdfIn PDF document text
    • http://olivamebel.com/alpine_mrv-m500_watts6sshe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://7f793f8f-877f-420e-851b-8bae9ea62a4d.filesusr.com/ugd/78c764_f9ff90b2bef0462b87b399dfdfe8f69a.pdf?index=trueIn PDF document text
    • https://28932ed2-21d9-4123-99cb-fcff0aac4472.filesusr.com/ugd/cc089a_2126a86b5a3b44609efb5ecbe27d2d96.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_851d1b909f2c45159d436d6b03417603.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cf0910df-b6f6-4064-9265-530a77071775/modine_hot_dawg_vent_kit.pdfIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_c5c1a2bd4fb1460383fc5943ceee15cb.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/31f707d9-799d-45c0-9ef0-e4be893215da/python_for_beginners_tutorial.pdfIn PDF document text
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_1c3762a0a0384e1baa5d976ca71dd8c6.pdf?index=trueIn PDF document text
    • https://3b9c8e93-52ab-41e8-96f8-e5fc639bf6fa.filesusr.com/ugd/fe3ccd_2e0f47b265dc4cf1bc44d995acb43764.pdf?index=trueIn PDF document text
    • https://010f2e21-25ca-4560-806d-08cbbb7c7db1.filesusr.com/ugd/74a852_7d7566c82e86476f8720893ede5c928d.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_8a133939231949019cdd6a5ef6611d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d6ebe04-aa0d-40cb-a4d4-4a57bff598cb/33322163005.pdfIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_570bdffc4a2441c7a3cb64914ebf3539.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bfa40af-f9e4-40dd-b4e4-dbd12433729f/how_to_open_a_zaxbys_franchise.pdfIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_ea25172d25674793bf0c7c7f55b3b460.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D2 5364 bytes
SHA-256: 86ae74720370627e61bb8b32b2cb8428557a254c78ad31999c3448dbaf87fa82
font_01_sfnt_off0001063b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1063B 10540 bytes
SHA-256: 7af79d20248a7690ae83c4d5b8bd0c1d8d1e8166b8ccbae55b61d6005f01b771