Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef354dbbc935a0a0…

MALICIOUS

PDF

73.9 KB Created: 2021-02-27 03:46:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0c8a5ac699ff1cf5d6d85d3fc70219d5 SHA-1: 3d91400fe08bd46255e4992eefa81c36c8f57334 SHA-256: ef354dbbc935a0a0a922acd17bb749948dd56b765095f9dfadeb127606c7ba95
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://nipisod.ru/strik?utm_term=what+was+the+omnibus+budget+reconciliation+act+of+1993 PDF link annotation
    • https://cdn.sqhk.co/wazilisiko/ie2ygdu/tower_defense_simulator_wiki_minigunner_skins.pdfIn PDF document text
    • https://cdn.sqhk.co/zikegasenar/fawPghR/big_winds_sup_center.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380213/normal_5fef359f2b1cf.pdfIn PDF document text
    • https://cdn.sqhk.co/kowaziwaso/7OieMic/sezetoxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409107/normal_6016cd868d004.pdfIn PDF document text
    • https://cdn.sqhk.co/satijumok/igAvzhd/cute_bright_yellow_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446285/normal_600b60cb12d4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450356/normal_5fdbbcb77ffc0.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/luxelula/60876901640.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabom/44084325265.pdfIn PDF document text
    • http://ximitexus.epizy.com/congratulations_card_template_printable.pdfIn PDF document text
    • http://pepajefosub.epizy.com/qld_fossicking_guide.pdfIn PDF document text
    • http://xatowumo.epizy.com/bpsc_65th_prelims_answer_key.pdfIn PDF document text
    • http://siverudatowu.rf.gd/types_of_adaptive_immunity.pdfIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/pajexibilinag.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_off0000e1b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B1 6052 bytes
SHA-256: bbef1da8eda1b1b98ba7cf9b354374384debf554f7609819c0d8ead6fed7d160
font_01_sfnt_off0000f63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63D 10708 bytes
SHA-256: afe45318f299536129e2fdc2bcdc7076bf05e74f51c0285f930a8b8003a4978d

Open this report in the interactive analyzer, or submit your own file for analysis.