Malicious PDF — malware analysis report

Static analysis result for SHA-256 51dd3fbbaeacf4b0…

MALICIOUS

PDF

80.8 KB Created: 2021-02-12 20:58:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 55babdd89eba27d2faf91e663fa53299 SHA-1: da386f00fe42ed46c821a28becc57c1197b8e202 SHA-256: 51dd3fbbaeacf4b04566145400d7f8ea397eb3b54eb52820ba89f874f58c7b24
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or SEO poisoning. The presence of external URIs and the link farm heuristic suggest the document's primary purpose is to redirect users to potentially harmful websites.

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://leonvi.ru/wix?keyword=sonosim+mastery+test+answers+cardiology PDF link annotation
    • https://mugafurevokez.weebly.com/uploads/1/3/4/8/134894013/dusowalino_xulubeka_viserajirojerej.pdfIn PDF document text
    • http://homiak.fun/xepizudomewarapexukalemqhzw7.pdfIn PDF document text
    • http://myyshooop227.site/95330290576gpqwl.pdfIn PDF document text
    • https://loseseseveru.weebly.com/uploads/1/3/0/8/130813975/xexosur_mupadim.pdfIn PDF document text
    • http://plsale.pro/9_months_before_october_24_2006aw1sy.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/gfsYhhh/bad_north_jotunn_edition_ending.pdfIn PDF document text
    • http://collegegraduatecentraldating.com/chomsky_theory_of_language_developmentln3u7.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/uiajbhf/wejelamafujekon.pdfIn PDF document text
    • https://runuwafulisejet.weebly.com/uploads/1/3/5/3/135337902/8738236.pdfIn PDF document text
    • https://xigeworimejol.weebly.com/uploads/1/3/1/4/131483719/loxovewakuzat.pdfIn PDF document text
    • http://blockingscenery.com/calas_of_calan_gamesurgyi.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/petuzutemixuvod/android_version_code_names.pdfIn PDF document text
    • https://s3.amazonaws.com/xalexojaxipud/27898817145.pdfIn PDF document text
    • https://s3.amazonaws.com/zozuxukoxo/5862991154.pdfIn PDF document text
    • https://s3.amazonaws.com/lejivugeleguwod/fagonumizumogegotubabe.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/bikodonovum.pdfIn PDF document text
    • https://s3.amazonaws.com/pajeriramal/kosepujopifuzedigepudi.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e77c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77C 5556 bytes
SHA-256: 42f66ac6aa2f34a39f020c20743293ebb99dab9f562f05fbc4dcece66fdd1ab5
font_01_sfnt_off0000fa5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA5E 10972 bytes
SHA-256: 0b84cd036c125cf83457924199062197a77c0ce12359387c551595ebf7768edc
font_02_sfnt_off00011fef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FEF 16204 bytes
SHA-256: 31aa257675234f953cb39254c73a0c002637764ec2691c470e0912636c3685cf

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