Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f337c8870aa3deb…

MALICIOUS

PDF

88.7 KB Created: 2021-05-31 19:59:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b40193994da0d728d9aa3eec273e861 SHA-1: e53b64a07f97edd1252f01eff437c47916fd0ad2 SHA-256: 0f337c8870aa3deb95fa6dcd755be6dbaa4981bfbb962f79ddfbb8b8736b373c
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable domains or are used in a link farm. The ClamAV detection and ML classifier strongly indicate maliciousness. The primary URL, 'https://jumiwimov.ru/123?utm_term=above+suspicion+tv+series+episode+guide', suggests a lure related to a TV series to direct users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jumiwimov.ru/123?utm_term=above+suspicion+tv+series+episode+guide PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4454436/normal_5fe607dbe4638.pdfIn PDF document text
    • https://mebifexet.weebly.com/uploads/1/3/1/3/131381374/3b57a.pdfIn PDF document text
    • https://rozapalevode.weebly.com/uploads/1/3/4/7/134705228/remotamalizuv.pdfIn PDF document text
    • https://rutesusu.weebly.com/uploads/1/3/0/7/130776221/5605455.pdfIn PDF document text
    • https://raralafelu.weebly.com/uploads/1/3/4/4/134476833/5799836.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446761/normal_6037adc29c124.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446772/normal_6053270184b3b.pdfIn PDF document text
    • https://lidonamu.weebly.com/uploads/1/3/4/7/134722791/7047218.pdfIn PDF document text
    • https://zomuguzilax.weebly.com/uploads/1/3/5/3/135327960/087695a.pdfIn PDF document text
    • https://gexawagezawa.weebly.com/uploads/1/3/2/6/132682787/busexomop-mefoj-jolegabalin.pdfIn PDF document text
    • https://wiwokuvivatazu.weebly.com/uploads/1/3/4/6/134629214/dezifadedawe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8967135-4d70-48b2-bb44-629ce8eac196/mortal_instruments_tv_series_season_5.pdfIn PDF document text
    • http://jajisaparev.pbworks.com/w/file/fetch/144412797/logic_pro_x_trial_mac.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144420294/lumedibelazepabap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62bb55b6-18bb-46d9-9268-1431d6653dc3/how_to_fix_preview_handler_in_outlook_2016.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/jugaralumamapunomos.pdfIn PDF document text
    • http://negovijalulu.pbworks.com/w/file/fetch/144412710/ejercicios_de_quimica_alcanos_alquenos_alquinos.pdfIn PDF document text
    • http://fevawigo.pbworks.com/f/plantronics_bluetooth_headset_pair_with_iphone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/773926be-8aa3-4701-bef0-d3da442b8804/what_are_some_signs_of_safety_risks_and_scams_online.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_off00011d22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D22 5188 bytes
SHA-256: f38c7ab737e4ca27a8e77808704f7d8472cccf34c3cca4e331f189b878d1cb17
font_01_sfnt_off00012edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDC 11644 bytes
SHA-256: eb9da3dfdda5ccadbcb194a6f9ce918551e5ac31d8619b6df0cfd82473dd9faa