Malicious PDF — malware analysis report

Static analysis result for SHA-256 148966f4e1868a19…

MALICIOUS

PDF

79.6 KB Created: 2021-02-06 05:39:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 03b3f10a3b0826b69d7f5f57bf159f0f SHA-1: 6f73ffff4738b5c9087b986793380f12fac8cd48 SHA-256: 148966f4e1868a1948eb618273bcb5d8e37e192071bda52e423b90bbe1af3b97
126 Risk Score

Malware Insights

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

The sample is a PDF file flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, a common tactic for distributing malware or phishing content. The presence of external URIs and the ML classification strongly suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/aws?utm_term=bokeh+effect+android+camera PDF link annotation
    • http://onlinetiser.website/virus_war_mod_apk_free_downloadyzlej.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388819/normal_5fd89e98415f6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487187/normal_601ba33a1490d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412413/normal_5fd04e560bfed.pdfIn PDF document text
    • http://kulinar2020.site/see_if_someone_blocked_you_on_discordrgdq3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393346/normal_5fd7cac0bf639.pdfIn PDF document text
    • https://cdn.sqhk.co/depifozopupe/WXIkgD4/pac_radar_iot_platforms_in_europe_2019.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcecd4d425f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372072/normal_5fef35e585dda.pdfIn PDF document text
    • http://topcabinets.xyz/kmspico_windows_10_activator_free8k3ps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386607/normal_6008cdb6d59a5.pdfIn PDF document text
    • http://babobekoru.66ghz.com/spelling_rules_for_ssc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412996/normal_600f86505e261.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rokosarod.rf.gd/gexanewopawewe.pdfIn PDF document text
    • http://rimupikerotazes.rf.gd/latest_android_mobile_phones_under_20000.pdfIn PDF document text
    • http://xejarejunap.rf.gd/free_printable_photo_booth_templates.pdfIn PDF document text
    • http://tefuguwo.epizy.com/branches_of_earth_science_worksheet.pdfIn PDF document text
    • http://vifudirowu.rf.gd/32174466901.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_off0000fbcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCB 5164 bytes
SHA-256: edd00cfddad041c4b17b0d2dc0345861d41def34cf46ad39cc7adedf86366171
font_01_sfnt_off00010d3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D3C 10692 bytes
SHA-256: fb4cdf0fc369582c3c283afb069237fbc54a256e6999d3fe66eda0d6c52c9810

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