Malicious PDF — malware analysis report

Static analysis result for SHA-256 adbae0ecf3704637…

MALICIOUS

PDF

67.2 KB Created: 2021-06-05 03:51:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 184c90e89cfb604fcc20fc8abb94ad8e SHA-1: 2dc6f7416b2ad66f5a0e17a2df60b7866f6b0e1d SHA-256: adbae0ecf37046372dc353bd9741111cda1fa724db6eef7448042aae09d1f8cd
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-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://druttle.ru/123?utm_term=yugbodh+biology+11th+pdf PDF link annotation
    • https://nobopejulalajib.weebly.com/uploads/1/3/4/6/134621416/9549368.pdfIn PDF document text
    • https://kiledakod.weebly.com/uploads/1/3/5/3/135385809/suwofanopi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450140/normal_606de5c493b58.pdfIn PDF document text
    • https://zokelafeg.weebly.com/uploads/1/3/4/8/134889419/muput.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_5ffe49752480f.pdfIn PDF document text
    • https://kigimijufofudiv.weebly.com/uploads/1/3/5/9/135977026/93f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5ff513aad43d9.pdfIn PDF document text
    • https://virikewujolitof.weebly.com/uploads/1/3/2/7/132712461/0d3d5d1d986ed2.pdfIn PDF document text
    • https://pafirolexorawu.weebly.com/uploads/1/3/4/6/134612045/9fdaa1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459464/normal_60185637635d6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sizolasipape.pbworks.com/w/file/fetch/144578127/sopa_de_letras_elementos_quimicos_resuelta.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/38299280003.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e18782eb-5a77-47a7-a637-76ea5dcec355/cv_indesign_template_free.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/relion_prime_code_eo4.pdfIn PDF document text
    • http://memofemovo.pbworks.com/f/hp_photosmart_2600_user_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a8ff56-e82c-4643-9fef-212224b95f0c/fejelozipoguzunebizori.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/358c2d54-b561-4957-bcfa-2241aac2cd6b/42175463804.pdfIn PDF document text
    • http://xugilip.pbworks.com/f/clauses_worksheet_year_6.pdfIn PDF document text
    • http://gibuwodebu.pbworks.com/f/how_do_you_get_unlimited_coins_and_keys_on_subway_surfers_for_free.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_off0000cbe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBE1 5072 bytes
SHA-256: 463ad100c873309ffb9c4a5c851932f2010cb60a0258819a0f33136eb47f8963
font_01_sfnt_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 10008 bytes
SHA-256: 9b62cacdef8a2386aabbba8522bf9fda6cda6e6986f208d4d9117f0be847f49b

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