Malicious PDF — malware analysis report

Static analysis result for SHA-256 29ac49b0e4807cf6…

MALICIOUS

PDF

82.4 KB Created: 2021-03-27 15:33:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 59f3fa843a9ce46a98d325f25b0e69a6 SHA-1: b7254159ce94f5b93a78724a691db414889a988c SHA-256: 29ac49b0e4807cf6d3733a46f096d24582b4e81fc750f4c79dc5bae711fe4bea
156 Risk Score

Malware Insights

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

This PDF document contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or a scam. The document body text and embedded URLs suggest an attempt to lure users to potentially malicious websites under the guise of providing academic resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://ponafet.ru/award?keyword=quimica+inorganica+libros+pdf
    • http://vienvozvrat.site/babizefejod9fbja.pdf
    • http://sallles.ru/how_does_social_learning_theory_explain_gender_developmenth92h3.pdf
    • http://sreda.city/how_to_get_google_earth_in_real_timexskdf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://6d251753-49d0-4f5b-a278-10ed1cacc9d0.filesusr.com/ugd/5c139a_675789c3706841579250e05c9461faff.pdf?index=true
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_4e37f9aa563e4fa68c80c70ba491bb43.pdf?index=true
    • http://farudigenudoze.onlinewebshop.net/bodybuilding_anatomy_2nd_edition.pdf
    • http://dowafirowelumex.atwebpages.com/bakozonukuripapavegan.pdf
    • https://0e01c86c-6ad9-43de-bc04-b8819f410213.filesusr.com/ugd/73c254_c836e9131ecb467eb9ed239cd48491be.pdf?index=true
    • http://jeborawaleko.atwebpages.com/sobidimezesusabir.pdf
    • https://s3.amazonaws.com/fogibi/venaxinanibuxizema.pdf
    • https://4d3f6715-1114-433d-a4b7-45a5e22e3858.filesusr.com/ugd/ce86b4_b0f62feb62cd47e4a8b8503c58833309.pdf?index=true
    • https://s3.amazonaws.com/betefowubevat/23902705113.pdf
    • https://89f68ddc-9f98-4e60-8afa-3e0ca6603e9e.filesusr.com/ugd/4725f1_a9ec96fce9c84739acbbd31f3f565ab2.pdf?index=true
    • http://pudolajuji.atwebpages.com/how_to_do_adjusting_entries_in_quickbooks_online.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_d4ebd96ac8e047dea068fa8e01b76028.pdf?index=true
    • https://48cc712b-de5e-493e-a198-f8962849e22b.filesusr.com/ugd/d2751c_c6e3c18de89f4c87a7345cffc78d9cf9.pdf?index=true
    • https://0296ecfc-28ae-4fa5-925c-67a25994cace.filesusr.com/ugd/c88839_ac0cc9e630974677be0407ba5c4c92b5.pdf?index=true
    • https://s3.amazonaws.com/tiluwisulepam/asuransi_kesehatan.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_off00010250.bin
53273406d7077beec8e44c0d9d9e1436c62ad153c99a2aff73762f8e3fd63a3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10250 5676 bytes
font_01_sfnt_off00011579.bin
939ecfd83f4f89b45c1f1c1912d6ee53bc8ae203c61dfbfe24bbb0e8beb2f7b6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11579 12124 bytes

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