Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a1f0e118dd1a15c…

MALICIOUS

PDF

68.0 KB Created: 2021-05-03 16:48:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0b413e49ecc2d7e9dc13344c16d367e5 SHA-1: af37738b8430af996cff546bcb71c143d5b3bb7e SHA-256: 9a1f0e118dd1a15cb8d19ae60a8d37013003328b4bc9956dac7702bf201ad7af
226 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to disposable domains and are designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body, though heavily obfuscated, appears to be a lure related to drawing tutorials, which is a common tactic for social engineering.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://botokaw.ru/strik?utm_term=how+to+draw+hair+in+procreate PDF link annotation
    • http://zazorin.scienceontheweb.net/31742095479.pdfIn PDF document text
    • https://cdn.sqhk.co/guzufaseba/eibwljb/tamogixekokowej.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/eEz6Fib/28166789107.pdfIn PDF document text
    • https://cdn.sqhk.co/zagakobafot/YKhg5hd/nice_button_ups.pdfIn PDF document text
    • http://rubeatyshop.xyz/pafeno9y00c.pdfIn PDF document text
    • https://cdn.sqhk.co/samivegin/SnHSFfw/nugij.pdfIn PDF document text
    • https://cdn.sqhk.co/keridola/if8geYL/basketball_goal_walmart_toddler.pdfIn PDF document text
    • https://cdn.sqhk.co/jiluputumusi/CZRjbsD/kikubezerebova.pdfIn PDF document text
    • https://cdn.sqhk.co/woselukafo/itnChxt/79762499008.pdfIn PDF document text
    • http://reduslimitalia-official.website/abraham_lincoln_vampire_hunter_bookei412.pdfIn PDF document text
    • http://com-login8.xyz/patudexefikevawibiz5fgz0.pdfIn PDF document text
    • http://jirobanu.22web.org/divowilipirikutem.pdfIn PDF document text
    • http://libunekuba.iblogger.org/tolajutawitazupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://80b2a579-f9ed-4aa0-b91a-ac3c8973c086.filesusr.com/ugd/353d00_5582ab4764f44e77969e6454a44b4bd5.pdf?index=trueIn PDF document text
    • https://c6de0af5-2a4c-46da-924c-839bccb102c6.filesusr.com/ugd/5f1f0f_4eea705c31d6426bb59654d70554cf27.pdf?index=trueIn PDF document text
    • https://fd7a53fe-11c1-4e60-83ad-ac1bb997268f.filesusr.com/ugd/5cf23b_512c548bec4b4f9d8117866aaefa5dcf.pdf?index=trueIn PDF document text
    • http://masemipeba.myartsonline.com/dogesajobubewupupesili.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_0e42b89eac2f4239b4ffbbbfdd2aab44.pdf?index=trueIn PDF document text
    • http://kuwaxubopuzar.rf.gd/i2_analyst_notebook_export_to.pdfIn PDF document text
    • http://wesovipimamino.epizy.com/simple_cake_recipes_for_beginners.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_off0000cda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDA1 5004 bytes
SHA-256: 59fc50c93abe37293ed0c68ff8eee7138d6fb598f16dcb0d48b28315af3f5a62
font_01_sfnt_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 10684 bytes
SHA-256: 26b005a9700f59537da8bc36305d64b8ebc21d8b357c5052724a76e6eb982128

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