Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc56279b08cbb43…

MALICIOUS

PDF

74.6 KB Created: 2021-03-13 21:46:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 888a5c6a8cd2be966e9c0a5d1a0c1009 SHA-1: 70181765de6cf37c0146501710ab5e12dea73cc4 SHA-256: 5dc56279b08cbb43a489e4d88444817792cd834e89fad0218319b31ac62be03c
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one prominent URL pointing to 'ponafet.ru'. Heuristics indicate this PDF is a link farm hosted on disposable domains, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious activity, likely involving the execution of JavaScript to facilitate the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 5

  • 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 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://ponafet.ru/strik?utm_term=bright+starts+ingenuity+cradle+%2526+sway+swing+briarcliff PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4468536/normal_5fdba79520231.pdfIn PDF document text
    • http://teksol.xyz/hora_santa_apostolado_da_orao9wklr.pdfIn PDF document text
    • https://kadezejuvi.weebly.com/uploads/1/3/4/6/134603763/lewexaxabos.pdfIn PDF document text
    • http://about-igsupport.com/how_to_redeem_code_on_switchpjjdd.pdfIn PDF document text
    • http://flash-sar.online/80927431047yxvvl.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456996/normal_5ff61e2e9418f.pdfIn PDF document text
    • http://milafikolume.iblogger.org/nodiwuruxaka.pdfIn PDF document text
    • https://xitolomeka.weebly.com/uploads/1/3/4/0/134012462/jesopidijex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465123/normal_600d47920541e.pdfIn PDF document text
    • https://vomuxetajamusu.weebly.com/uploads/1/3/1/8/131857717/6342994.pdfIn PDF document text
    • http://trysoda.pro/34273147723kzur6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470981/normal_600c6f0e728de.pdfIn PDF document text
    • http://torchqbfl.fun/80315225251ydp65.pdfIn PDF document text
    • http://penaleduduzib.iblogger.org/small_split_file.pdfIn PDF document text
    • http://theandyhong.com/porukakunokipitjiyqq.pdfIn PDF document text
    • https://folukufisika.weebly.com/uploads/1/3/1/3/131384255/nugukeka_faditu_togaw.pdfIn PDF document text
    • https://roturusuwanowus.weebly.com/uploads/1/3/4/3/134363773/2764653.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/bca1940a-a6c5-458e-afc4-1b216260c246/why_is_my_garbage_disposal_not_running.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/452a93fd-9035-45a6-849b-ec0180fb7727/zeruwaleb.pdfIn PDF document text
    • http://dorigerujakaf.rf.gd/11932457528.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/156c49c9-dfa2-4e2b-949b-b6e3d2e99526/the_open_window_by_saki_plot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aadfab2d-72a7-4b86-b79c-07c54f109a24/husqvarna_hu700h_mower_blade.pdfIn PDF document text
    • http://miwufojo.epizy.com/bitomaruselabemapavumib.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9F3 3060 bytes
SHA-256: 4498bb3bd9bb25ce850fb063e2e5d2e0c165039009b8a6727e240f013253f8c6
font_01_sfnt_off0000e4f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F6 5352 bytes
SHA-256: ff604e307d0b4fb1decf251e246ab94e62d4fcdd1ac05fab5be6fdc816612a5a
font_02_sfnt_off0000f72e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72E 10832 bytes
SHA-256: d626eeb76c317a32c0af851f9faea157c2e4f914d1ff94b8436c47c1514e282b