Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9e8604d6719503…

MALICIOUS

PDF

91.3 KB Created: 2021-03-29 01:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 43be908203fe88989425a8c523b6dc40 SHA-1: 9d46b3485342cdd804993c3c00846b58c1286061 SHA-256: db9e8604d67195032f5f84221395da578b3678299abf6976fb7102a9631252ea
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a critical heuristic identifying a link farm designed to host many PDF files. One of the primary external URIs points to zajinet.ru, which is likely part of a phishing or malware distribution scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://zajinet.ru/aws?utm_term=contrato+de+arrendamiento+de+vivienda+gratis+en+word
    • https://xogosafaxisomig.weebly.com/uploads/1/3/0/7/130739024/999286f.pdf
    • https://wiwovadale.weebly.com/uploads/1/3/5/3/135322143/4873734.pdf
    • https://xizejaselaz.weebly.com/uploads/1/3/4/3/134357450/tewolefafogaxun.pdf
    • https://gofubajub.weebly.com/uploads/1/3/4/6/134632898/25d537b273.pdf
    • http://goossyy.online/240886004670pgt9.pdf
    • https://mudufisapegew.weebly.com/uploads/1/3/6/0/136097401/zopajako.pdf
    • http://monongzhlh.space/85716273437pw1mn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d2633ea4-122d-4c6f-9012-acaafba07635/resumen_de_cada_capitulo_del_libro_el_guardian_entre_el_centeno.pdf
    • https://uploads.strikinglycdn.com/files/50bb6d6e-00ea-4ef9-b1a1-f264c13b9269/fubetoribedipiravugigex.pdf
    • https://uploads.strikinglycdn.com/files/5d66f2a7-e085-444d-8069-3c927d573f9e/the_ego_and_the_id_author_crossword.pdf
    • https://uploads.strikinglycdn.com/files/57fb10ac-a558-487a-a84c-95debadbfcc4/ford_mustang_ecoboost_engine.pdf
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_8598fd4bdff74507acf6e3fc4b1a144b.pdf?index=true
    • https://uploads.strikinglycdn.com/files/c5a2cb60-7ca6-4742-b88c-232247656c80/timugikumawenifowopubej.pdf
    • https://d3826037-6016-486c-99e9-dc41bc666644.filesusr.com/ugd/b81754_d492fa87f90842b1aa7fb3b6a149bd4d.pdf?index=true
    • https://uploads.strikinglycdn.com/files/2d270d9a-1e40-4302-bf45-4fefa1679788/2007_jeep_grand_cherokee_3.0_l_diesel_review.pdf
    • http://dimonejoxu.rf.gd/kitemojewetujerij.pdf
    • http://ropurudowilume.rf.gd/seagate_crystal_report_9._0_free.pdf
    • https://1a73feee-b327-4bc5-ac54-9d367b44a425.filesusr.com/ugd/226baa_65845c8298fd48eea777c368def01725.pdf?index=true
    • https://uploads.strikinglycdn.com/files/65c1e876-a6f0-46c1-ba94-be873e447fb0/how_to_drive_manual_downhill.pdf
    • https://uploads.strikinglycdn.com/files/a8df7f7a-0e23-495b-a9d0-27378bad0550/wakebuvisigofaduwolowazo.pdf
    • https://uploads.strikinglycdn.com/files/ed137012-d435-4fec-8b9e-19254100ff6d/how_do_i_become_a_certified_forklift_trainer.pdf
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_78930d522a1f449ca8a20cab416a6d4d.pdf?index=true
    • 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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f306.bin
b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF306 6744 bytes
font_01_sfnt_off000103eb.bin
eb1db157cc8eb2bdf3f1bca6cb4982ceaf93a4c51727c53f85252b598bc9d8a1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103EB 5168 bytes
font_02_sfnt_off00011572.bin
8e4464e70a4bba9462354f55578442c9ef82b6cc9beb01204a89676027354c8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11572 3208 bytes
font_03_sfnt_off0001224d.bin
c65670a14d101393673bde38843072e04843e401ae0f912d9afa25e9da3231be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1224D 11556 bytes
font_04_sfnt_off00014819.bin
f64a35f27be193fd5e18e0728aead7cb0478ac4ab890dc06fe1def2ebe5deb6d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14819 16240 bytes

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