Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2304fea2dfd3f8c…

MALICIOUS

PDF

74.8 KB Created: 2021-03-27 22:10:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04ad7afaf583045d294159879b93b04b SHA-1: 52ff4426821a666741baa95c7028a0e2746bcc5b SHA-256: a2304fea2dfd3f8c5a36f69c55a900ae9a01ca97d2fdd00c311c9858a1bf2fb5
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by multiple heuristics, including ClamAV and an ML classifier, and contains embedded URLs. The heuristic 'PDF_SEO_LINK_FARM' indicates the document is designed to host a large number of external links, likely for SEO manipulation or to redirect users to malicious sites. The presence of external URIs suggests an attempt to direct the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://xezojetit.ru/award?keyword=prepositions+and+conjunctions+exercises+pdf
    • http://pixunune.sportsontheweb.net/supix.pdf
    • http://viwavidif.getenjoyment.net/brown_and_levinson_s_politeness_strategies.pdf
    • http://pewadulojuba.mypressonline.com/4148801171.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/jinabisura/22173073031.pdf
    • https://uploads.strikinglycdn.com/files/203a0d5d-8bdb-4591-9af4-795c4a2e9d3f/nato_phonetic_alphabet_examples.pdf
    • https://s3.amazonaws.com/lolaritemukole/english_placement_test_with_answers.pdf
    • https://uploads.strikinglycdn.com/files/5bca2a91-bdeb-4273-a797-373d46cebdb0/gekufumusofuj.pdf
    • https://86a9da1b-0b57-4b35-a77a-523886b904cd.filesusr.com/ugd/0d9a50_694f2c2422294436bed87e76181adafa.pdf?index=true
    • https://s3.amazonaws.com/wizedumi/33571632703.pdf
    • https://s3.amazonaws.com/sowirutelevolur/functional_areas_of_business.pdf
    • https://s3.amazonaws.com/wetevali/18823679342.pdf
    • http://jowosos.myartsonline.com/47114987123.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/what_is_the_best_celestron_telescope.pdf
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_f9daa6b391974cbf86f1ef33830a516a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a60a30bb-26ec-4766-880a-6de186e334e8/solid_state_physics_s_o_pillai_free_download.pdf
    • https://s3.amazonaws.com/petubapizo/maplestory_leveling_guide_luminous.pdf
    • https://s3.amazonaws.com/sezebepit/ruzirotatape.pdf
    • https://s3.amazonaws.com/kegubinefuda/odia_new_song_pagalworld.pdf
    • https://b5f169ef-6bcf-4d19-a24b-32bdc9dd7a5f.filesusr.com/ugd/2e79a6_f72a74a27dc5448da053955f5831b33e.pdf?index=true
    • https://s3.amazonaws.com/wiremeresegikon/como_funciona_la_destilacion_por_arrastre_de_vapor.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5b5.bin
d9f9a34fbf1f107d1a606388a7a0acc01fab569267372f0ad1df230b98a870e6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B5 5260 bytes
font_01_sfnt_off0000f7b1.bin
86acf8f1ed6d876aa7ea7f051c79237dd2edae7edc6cea3550a4c17f531d6c30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B1 10636 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.