Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d26e1f9992707a…

MALICIOUS

PDF

63.6 KB Created: 2020-11-11 21:01:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: de736127272896e53b115e67f0cd5d27 SHA-1: 91050a2d8945f3bbb104369e88744ec975b34432 SHA-256: 77d26e1f9992707ac876ee06a310359c2bd2eb6a5f5d34da75ad1b413d059052
166 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 an ML classifier. It uses a password-protected-archive lure. 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

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://trafffe.ru/aws?utm_term=atp-+adp+cycle+worksheet+answers PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378848/normal_5fa145e5604a8.pdfIn PDF document text
    • https://kafasomawupi.weebly.com/uploads/1/3/0/7/130775431/9e5d02a.pdfIn PDF document text
    • https://nivawapononagi.weebly.com/uploads/1/3/4/2/134234681/rokarazujusid.pdfIn PDF document text
    • https://xuxulavadimuxa.weebly.com/uploads/1/3/4/2/134234789/5408110.pdfIn PDF document text
    • https://sakuvida.weebly.com/uploads/1/3/0/7/130775714/laxajebesam_botigitexux_jutojanikul.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/wogiselaruto-nokage.pdfIn PDF document text
    • https://sizigemud.weebly.com/uploads/1/3/4/6/134606095/muridasitafudose.pdfIn PDF document text
    • https://figurera.weebly.com/uploads/1/3/4/4/134437403/jinoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/c67c1ebe-0b1d-41fd-a781-b5225d10e147/12234580573.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c77cc4d3-46a9-4e50-8b27-5b4a43bfef90/mawopumenib.pdfIn PDF document text
    • https://s3.amazonaws.com/jadudusujuje/rukilusabolasazexurek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a872a2ca-c489-4c5e-a564-3d54675d3d9d/epa_section_608_preparatory_manual_9th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16654bbb-389e-41e9-9c03-2eb7c1c27787/buzedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6ea3faa7-9c8f-4201-be6c-7664ee1c7f69/rajiruma.pdfIn PDF document text
    • https://s3.amazonaws.com/viromibukoleliw/89358708179.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/668419e0-c221-462b-a9d7-a499963425fe/72629684567.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB09D 5180 bytes
SHA-256: fffd38f9eb95ffdb0b4eae0e8052c29097bec396f254358b6725d2e8533385ad
font_01_sfnt_off0000c242.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC242 9536 bytes
SHA-256: 3a7d6a434d833e8ab31b67311b2ebdc1ee807f578b56e0b75251da97dfc4f74a
font_02_sfnt_off0000e2ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FF 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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