Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0af0807a7a8de33…

MALICIOUS

PDF

79.9 KB Created: 2021-03-12 20:27:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 807c04e6729fef19f86acc2986bfd740 SHA-1: a0bdd46bbd0e16e10f6e356668d8a0512b68a32e SHA-256: f0af0807a7a8de3375576935fd04eefa182bc9526ed751327e9486066c8d3b89
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs and a heuristic firing for a 'link farm' on disposable hosting, suggesting it's designed to redirect users to malicious sites or download further payloads. The presence of a 'download button' heuristic further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/award?keyword=astm+a536+pdf+download PDF link annotation
    • https://cdn.sqhk.co/bisuligiga/ilUgiqi/bikajapem.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378157/normal_5fe5b225ed7bf.pdfIn PDF document text
    • https://cdn.sqhk.co/mifigatira/RpgeDge/play_woody_blocks.pdfIn PDF document text
    • https://bipilebel.weebly.com/uploads/1/3/1/6/131606150/6480661.pdfIn PDF document text
    • https://cdn.sqhk.co/rotexopapi/HnDjbih/sejemivevotesolex.pdfIn PDF document text
    • https://cdn.sqhk.co/puxezuxivas/fGvGnhe/top_trending_topics_today_sabc_news.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464082/normal_5fd1630361cb6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493600/normal_6047f22b8699e.pdfIn PDF document text
    • https://cdn.sqhk.co/buganixezu/hjhVL5Q/44140349958.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_602eac25b8ff9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380230/normal_602c31d0e1df3.pdfIn PDF document text
    • https://salewuso.weebly.com/uploads/1/3/1/3/131379029/zukaruguse-zejorogefaw-wefafaja-ferutenejimimi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374368/normal_5fe8f3577ce70.pdfIn PDF document text
    • https://nuvoligugepujo.weebly.com/uploads/1/3/6/0/136092189/7dc751d4d7dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387419/normal_603e56d5830ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489969/normal_60329cde0cbff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kafopazam.epizy.com/64353643361.pdfIn PDF document text
    • http://woxedizoxe.rf.gd/30309195370.pdfIn PDF document text
    • http://folizel.epizy.com/how_to_get_satellite_view_on_google_maps_on_iphone.pdfIn PDF document text
    • http://xivoganunew.rf.gd/11811281344.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/89037153415.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_off0000fb10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB10 5612 bytes
SHA-256: b54d1ef2a12b0e0a3586a43d35a4cfbf854697aaacb949849bd9de0d02b34f7a
font_01_sfnt_off00010e2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2F 10544 bytes
SHA-256: aafcd7b1c6bb4ed4d8186fffdc784f84e94b0cd52ae906d3bcb69b80fc63c1c0

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