Malicious PDF — malware analysis report

Static analysis result for SHA-256 6baa3c762f0c744c…

MALICIOUS

PDF

72.4 KB Created: 2021-03-07 06:58:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 1c792e70e76356558c1a1fe363831c46 SHA-1: a021572501c4013d8b3f9e39b3355cfde752cfbd SHA-256: 6baa3c762f0c744c246d6ebb8f15f4009c0dbf403fdc87fba67ac8f9bbd8cf0a
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing attempt. The embedded URL 'https://leonvi.ru/wix?keyword=nero+2016+serial+number' indicates a potential lure for software cracks or serial numbers, a common phishing tactic. No scripts were extracted, but the PDF structure and numerous external links strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://leonvi.ru/wix?keyword=nero+2016+serial+number PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407060/normal_602b5cb723e1e.pdfIn PDF document text
    • https://cdn.sqhk.co/lidupusumoj/eVVgjcP/castle_defense_2_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pegipoveridi/sj4TjdR/fawitedab.pdfIn PDF document text
    • https://cdn.sqhk.co/vizelupavew/LvjakIf/real_riders_barrow.pdfIn PDF document text
    • http://bigchance.pw/640362045202bdsd.pdfIn PDF document text
    • http://leadtop.co/70629096795xvlkt.pdfIn PDF document text
    • https://cdn.sqhk.co/bezakebijuk/Efgehac/fill_color_shortcut_excel.pdfIn PDF document text
    • https://fibukumaguwin.weebly.com/uploads/1/3/4/7/134770434/72d578.pdfIn PDF document text
    • https://tilivugex.weebly.com/uploads/1/3/4/1/134108965/314528.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/bjhjbhd/dijobenazakodevepigud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443354/normal_600a1fa454802.pdfIn PDF document text
    • http://vilopeg.xyz/tisozuzaj8o69k.pdfIn PDF document text
    • http://belldiscount.ru/64428582254zoyvw.pdfIn PDF document text
    • https://mevinabepoke.weebly.com/uploads/1/3/2/7/132740553/budevotodorupux_sukudo_jaburi_munukogab.pdfIn PDF document text
    • https://wivutukezed.weebly.com/uploads/1/3/1/4/131438473/ginebewiforix.pdfIn PDF document text
    • https://dewapapowirise.weebly.com/uploads/1/3/1/4/131438248/wadalinifi-rejijizisiti-jeloz-pafinoxixu.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/ffe7d3f0-960e-4c9b-a5b1-ffb9c8ffa19a/86127320026.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b81fe8ee-4a9b-4595-85fe-4f43b6b86dab/brady_infinity_gauntlet_meme.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe2cbfa2-c941-40a5-abb6-2bdbbc0990d3/56345791977.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_off0000deb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB6 5420 bytes
SHA-256: f9ceca1074ea6e4f60fa7c5705ea5e033a43c4938231c9ac350c02c88d2fbb7d
font_01_sfnt_off0000f10c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF10C 10252 bytes
SHA-256: 568847d22daa3668817b9415a121597d6d0a2624a58f3d70985e95a3793baaa7

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