Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f4b31a1e62a3c12…

MALICIOUS

PDF

70.6 KB Created: 2021-02-20 22:07:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: f4a5f76e2363daebec060905433b3c96 SHA-1: 654fc68e5432d9d0fcfda2269120bfa29c5de2c3 SHA-256: 8f4b31a1e62a3c12942d2b7896de00e0eab83aa2cf22686007b414783b1ec93b
134 Risk Score

Malware Insights

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

The PDF contains multiple external links, some pointing to disposable domains and Weebly hosting, indicative of a phishing or malware distribution scheme. The presence of a 'download button' heuristic further supports the lure-based attack pattern. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://jacksth.ru/wb?keyword=asus%20router%20rt-ac68u%20access%20point PDF link annotation
    • https://judozonax.weebly.com/uploads/1/3/1/4/131454501/9924428.pdfIn PDF document text
    • http://good-production9.site/xeruzikavamaei7k.pdfIn PDF document text
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/keretesofuwuw.pdfIn PDF document text
    • http://citrus-fruit.space/golirukijazatenuv1vzim.pdfIn PDF document text
    • http://piredvizhnik.com/410309957835yam8.pdfIn PDF document text
    • https://kexofoxofoxo.weebly.com/uploads/1/3/5/3/135318322/a7a81e669d.pdfIn PDF document text
    • http://fodosokidorakig.22web.org/mcculloch_eager_beaver_3.7_ci_chainsaw_manual.pdfIn PDF document text
    • http://limecash.xyz/wiczenia_gramatyczne_angielski_klasa_5hm4t5.pdfIn PDF document text
    • http://weraka.online/newspaper_report_example_ks2fa37m.pdfIn PDF document text
    • https://famopenagunabot.weebly.com/uploads/1/3/4/6/134688774/815b7.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/tosego/srimad_bhagavatam_stories_in_english.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_off0000d6dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DC 5264 bytes
SHA-256: 02cb9cfb3f2fc20834be245d1fb714ee9edb17448318e876f0c7b6c0bbf23ea8
font_01_sfnt_off0000e8d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D1 10984 bytes
SHA-256: 4194d6cb6fba0fdf05ae2be1d571cefe41f6feedaef259a9b846b900f2b3334d

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