Malicious PDF — malware analysis report

Static analysis result for SHA-256 e294307359716252…

MALICIOUS

PDF

77.7 KB Created: 2021-03-07 06:43:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 86deebcc009ded076446bc57ae734bb9 SHA-1: d5f0360631f124092d3adee1a90fb3a8ee6c70c6 SHA-256: e2943073597162528e5185748752e3b53042067bb2840e04f04e5a204f65d25f
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting it functions as a link farm for SEO manipulation or to redirect users to malicious sites. The presence of embedded URLs and the heuristic firing for PDF_SEO_LINK_FARM strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=ms+word+table+of+contents+links PDF link annotation
    • https://wanesibib.weebly.com/uploads/1/3/4/5/134591449/xozuvaxujakoresubuf.pdfIn PDF document text
    • https://dalibigexewekef.weebly.com/uploads/1/3/2/7/132712129/puroz-nofawuwilifibuw.pdfIn PDF document text
    • http://anbieterbewertung-autoscoutch.com/barredora_manual_escoba_magicaeiwpy.pdfIn PDF document text
    • http://clobuss.ru/gaston_armando_gonzalez_bejarano_paiij46f.pdfIn PDF document text
    • https://zizusufake.weebly.com/uploads/1/3/4/6/134646877/8eba205.pdfIn PDF document text
    • http://tranquils.space/driver_stampante_canon_pixma_mp160_windows_10krphk.pdfIn PDF document text
    • https://tujozidu.weebly.com/uploads/1/3/4/6/134694944/9207572.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/b80661d015b.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/jivagajamav/angular_6_radio_button_formcontrolname.pdfIn PDF document text
    • https://s3.amazonaws.com/taguxif/brightness_slider_not_working_android.pdfIn PDF document text
    • https://c0b8f06b-4e98-4d3d-89ef-2f08caba629a.filesusr.com/ugd/0c8cc8_a7176cf46dca445695ea95d472699305.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd924643-a4e3-4e04-bfb5-d46812771be9/what_is_the_best_personal_cloud_storage.pdfIn PDF document text
    • https://01dc7cc6-b8ed-446e-8cc8-1ad78882ed38.filesusr.com/ugd/e23fbb_13d8367ca962498586e9b1edd81f4b41.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b7c4add0-20de-4023-8e6c-7645cf8bdd7a/36899914070.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e09bda63467e4f54a97dd362d781af31.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kulinisokakewi/95232873486.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36c7112a-fe04-4269-8f50-91d8571ea14a/98180102377.pdfIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_a9c1db4df79b4ac7835a5246cb8dca44.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c029265-a729-4901-a37d-57afc0166dbb/apple_beats_solo_pro_vs_studio_3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7001c842-f56a-484c-8388-1bd29459d613/zubizurufisepapakonor.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_e6ec302f08e34e04aa6bfda928d83b9e.pdf?index=trueIn PDF document text
    • https://c6926203-1eb9-401e-9afa-11f61f201807.filesusr.com/ugd/685707_e9dec36c33234cc78a0cfdc611b20a31.pdf?index=trueIn PDF document text
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_15bae487b3a84eecb4a151627a4868fc.pdf?index=trueIn PDF document text
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_5450e2badcba4432beb68efd13c79e5f.pdf?index=trueIn 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_off0000f2fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2FD 5316 bytes
SHA-256: 18f6edda8d6a19538d943275a3586e58dbb8ce598b34b1cd04b3d69fdc768c52
font_01_sfnt_off0001053f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053F 10512 bytes
SHA-256: 83cd94568c069cf662dcdfd964e1d4142bbcb9e023e5ed7675a120055aeb0b96