Malicious PDF — malware analysis report

Static analysis result for SHA-256 21699e81b4fabe92…

MALICIOUS

PDF

89.2 KB Created: 2021-03-26 15:14:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 0395000ca0e24e6787d5017276aeebd9 SHA-1: 8dc008292501a7858f2fc39bb2baf2e75262dce0 SHA-256: 21699e81b4fabe92393a2afab8751fa0d10241604fa7abf1b4f9e12f26fc7ab7
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, indicative of a link farm or phishing operation. The 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' heuristics strongly suggest malicious intent, with ClamAV identifying it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a phishing or SEO-based malicious content delivery. The document body, though heavily truncated and obfuscated, contains keywords related to service manuals, likely used as lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://leonvi.ru/award?keyword=caterpillar+sr4+generator+service+manual+pdf PDF link annotation
    • http://kirakexig.mypressonline.com/john_deere_214_for_sale.pdfIn PDF document text
    • https://ledobosu.weebly.com/uploads/1/3/1/3/131383424/4ddf46e.pdfIn PDF document text
    • http://fajamad.mypressonline.com/xafunububevi.pdfIn PDF document text
    • https://dubebonu.weebly.com/uploads/1/3/0/8/130874554/gizarudefawaxav.pdfIn PDF document text
    • https://cdn.sqhk.co/vixemujomu/ehi1ntF/rabumolasobabitorijeke.pdfIn PDF document text
    • https://cdn.sqhk.co/xiruregexibe/egcVboj/24529628664.pdfIn PDF document text
    • https://jubekufolofifi.weebly.com/uploads/1/3/4/5/134593927/nenijow-nugigelexurug-pebadelanin.pdfIn PDF document text
    • https://bivibubumi.weebly.com/uploads/1/3/1/6/131637176/dabipu_fatuwuv.pdfIn PDF document text
    • http://potuxoposutu.medianewsonline.com/suspension_training_trx.pdfIn PDF document text
    • https://susudomi.weebly.com/uploads/1/3/5/3/135319884/9948494.pdfIn PDF document text
    • https://fogunovavak.weebly.com/uploads/1/3/2/6/132681822/bb4b480.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/dagigefari.pdfIn PDF document text
    • http://didazema.mypressonline.com/how_to_read_like_a_writer_mike_bunn_analysis.pdfIn PDF document text
    • https://cdn.sqhk.co/monasomeb/i9jb8j6/resuvinupixafepogibovobe.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/how_to_fix_a_john_deere_riding_lawn_mower.pdfIn PDF document text
    • https://pebawatiwokup.weebly.com/uploads/1/3/4/5/134576243/273f26ed.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/xixonu/what_is_the_best_online_diary.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/is_heating_oil_smell_dangerous.pdfIn PDF document text
    • https://s3.amazonaws.com/gateme/52193368570.pdfIn PDF document text
    • https://s3.amazonaws.com/mokamoba/convince_me_meme_template.pdfIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/guia_ceneval_preparatoria_2020.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e726.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE726 7208 bytes
SHA-256: e0da03bd6c7a053f339da5e73283977a418110c69c6128e553807741cad01296
font_01_sfnt_off0000ffc5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFC5 5528 bytes
SHA-256: 22c2e57841bb9cb4080d33e1fb841d444ba2d31dc63d7364bfe9c5ad9b6d83b5
font_02_sfnt_off0001127f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1127F 1732 bytes
SHA-256: c3d8687f1465c001379092e26d904f3d8a90bcaefaf74605bd3425cc9e3e88d7
font_03_sfnt_off00011b0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B0D 11292 bytes
SHA-256: be4808754514e06c385aaa6b2b7b67df377a88b5c7f72cdb0df7a2169d839fc0
font_04_sfnt_off0001413b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1413B 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f

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