Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad0bca4f2bd1efdc…

MALICIOUS

PDF

68.2 KB Created: 2021-06-01 01:51:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 281070b9b7232756d6174814e3c70ebf SHA-1: 9894e561afc3bf57b3c8a1ef0d7d577ac4f07ec4 SHA-256: ad0bca4f2bd1efdc86d70e9b8aed33792692c236edf6a43c87e0ee5be1d4b923
186 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to disposable hosting services. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cructi.ru/pbw?utm_term=dynamite+recruitment+timesheet PDF link annotation
    • https://fukoroxovelamos.weebly.com/uploads/1/3/0/7/130776486/xopibugumuvanogiva.pdfIn PDF document text
    • https://povoligijiz.weebly.com/uploads/1/3/4/6/134665243/38f1fa50d53150.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417319/normal_6061aaf4af73c.pdfIn PDF document text
    • https://somejokal.weebly.com/uploads/1/3/4/4/134494219/1943864.pdfIn PDF document text
    • https://sopowifumerage.weebly.com/uploads/1/3/4/3/134355846/komuje-jewif.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426063/normal_5fd927dbd543c.pdfIn PDF document text
    • https://pigiwikabulate.weebly.com/uploads/1/3/1/8/131856715/174480.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472783/normal_603026e1c2156.pdfIn PDF document text
    • https://dubasebajulux.weebly.com/uploads/1/3/1/3/131382081/5600271.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449205/normal_602e7e15bb8a0.pdfIn PDF document text
    • https://lopetumidola.weebly.com/uploads/1/3/3/9/133989387/21944ebd6027.pdfIn PDF document text
    • https://rirudelibuwa.weebly.com/uploads/1/3/1/6/131606594/winikotepejebaw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kekirow.pbworks.com/w/file/fetch/144412473/bir_kawit_phone_number.pdfIn PDF document text
    • http://nigezid.pbworks.com/w/file/fetch/144428436/zudavopapikopeweroxogom.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/1776_musical_libretto.pdfIn PDF document text
    • http://zeladejan.pbworks.com/f/pokemon_mega_emerald_x_y_zip_download.pdfIn PDF document text
    • http://pezeliv.pbworks.com/w/file/fetch/144417537/download_bluetooth_for_pc_windows_7_filehippo.pdfIn PDF document text
    • http://jajafad.pbworks.com/w/file/fetch/144428229/canon_lbp6000_lbp6018b_driver_download_windows_8.1_64_bit.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/how_to_find_instantaneous_rate_of_change_formula.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/neluxadutepokoxemebar.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/what_is_the_best_translation_of_the_catholic_bible.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cd58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD58 5108 bytes
SHA-256: 67fb7b410dcc1062f4c0cac8bae5c735fd6b51eecc566a4b144bab5eb2c96b98
font_01_sfnt_off0000de99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE99 10772 bytes
SHA-256: 74bcf8072e8da53c29cc030f1a95635024a3ecae046acddc306d5609af30c174