Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd89ca7c7220f1b6…

MALICIOUS

PDF

87.9 KB Created: 2021-05-06 10:27:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a58d16571aa42c68d8a35a2962c20f7f SHA-1: c78f54ce93be0cb6c28c493367eb2947cd737f44 SHA-256: fd89ca7c7220f1b626b2fdb9486edaeb8180e59cff084fa4c8e30231dbfdfe06
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous external links, many pointing to SEO-optimized pages designed to redirect users to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_UTM_REDIRECTOR_LINK' heuristics. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and linked URLs suggest an attempt to trick users into downloading further payloads.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://baarspo.ru/strik?utm_term=yamaha+rx-v379+setup+guide PDF link annotation
    • https://retowukiri.weebly.com/uploads/1/3/4/5/134592720/ffa8336d4ec180.pdfIn PDF document text
    • http://tujozavido.66ghz.com/whatsapp_plus_atualizado_2018.pdfIn PDF document text
    • http://zemesod.getenjoyment.net/57290060653.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392457/normal_603863d682211.pdfIn PDF document text
    • https://tobuveforo.weebly.com/uploads/1/3/0/9/130969072/pimasulud.pdfIn PDF document text
    • https://vesukinixemijuw.weebly.com/uploads/1/3/2/6/132696016/6451525.pdfIn PDF document text
    • http://tokesuditetu.getenjoyment.net/bhagavad_gita_book_in_bengali_free_download.pdfIn PDF document text
    • http://poxiror.22web.org/cido_ortico.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff409ab66663.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/sasufufa/camera_lucida_reflections_on_photography_summary.pdfIn PDF document text
    • https://s3.amazonaws.com/zupenafud/gavebexuzikaku.pdfIn PDF document text
    • https://s3.amazonaws.com/godewumazek/87809211800.pdfIn PDF document text
    • http://wepunulirepobi.myartsonline.com/russian_alphabet_practice_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/dovulavavo/40997333522.pdfIn PDF document text
    • http://govilike.epizy.com/adjektivdeklination_nach_dem_bestimmten_artikel_bungen.pdfIn PDF document text
    • https://beb587af-1766-4a1c-893d-8c04a9882fa7.filesusr.com/ugd/f3bec4_04f353e2ae5c4b69a4d168b334bb0b33.pdf?index=trueIn PDF document text
    • https://438e95ed-c264-4db5-88d3-1a9ca8b91b86.filesusr.com/ugd/733c1f_833533ecea5441c5abb81269e05a2ea5.pdf?index=trueIn PDF document text
    • https://78636f1b-f2d6-4e4a-b4e1-07eac4c165d1.filesusr.com/ugd/434c97_c059102c61f54e918ffab2f5e03127e7.pdf?index=trueIn PDF document text
    • https://48b7024d-7414-4593-b44d-ed892b96ad15.filesusr.com/ugd/3e5db3_ecdc086ef22f4553a8b81c6862adfe7b.pdf?index=trueIn PDF document text
    • https://40785fcd-1e5e-4316-9306-5db1d5795eae.filesusr.com/ugd/2f07a1_9c9e2ef39a0440ecb81b1cfe54b2eb68.pdf?index=trueIn PDF document text
    • http://xobuxadoxexe.epizy.com/vafiwukewowezoxawuv.pdfIn PDF document text
    • https://s3.amazonaws.com/juzinaramip/annual_appraisal_form_format.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 3072 bytes
SHA-256: b22f0bb88d7d744beb00d43f5767f17d3862f882e568ece7a73e5a22ffab8b4e
font_01_sfnt_off0000fef1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF1 5864 bytes
SHA-256: aa75c2131e2d7d0015ba3012205f4ff022170c73c96e9c23ca9f78924819ae9e
font_02_sfnt_off000112d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D8 11904 bytes
SHA-256: acf4e5d25d0a3d9df68565c59b7063cbb64224e85d8730b0722804c765321de3
font_03_sfnt_off00013ad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AD9 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd

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