Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a3530ead6e5056c…

MALICIOUS

PDF

74.3 KB Created: 2021-03-05 20:22:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: e3510b88bcf5809c7cc8ab4404b66759 SHA-1: f3a85289068c7974efc52404fc73d089aaa76f4a SHA-256: 0a3530ead6e5056cdcb1befbd3ad14deb2ae8b306dcb9fcc9a65da578588a226
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document functions as a link farm, containing numerous external URLs pointing to disposable hosting, a common tactic for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic strongly suggest the document's purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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/wix?keyword=distinguish+purebred+and+hybrid PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366313/normal_603ed8a7281ac.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/wukamazugudiwaro.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/john_green_looking_for_alaska_book.pdfIn PDF document text
    • http://misstourist.info/33933578539l18p9.pdfIn PDF document text
    • https://vogoniboka.weebly.com/uploads/1/3/1/0/131070279/7732e7.pdfIn PDF document text
    • https://jobeluke.weebly.com/uploads/1/3/5/3/135318189/1627191.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492272/normal_5ff0bb84335ed.pdfIn PDF document text
    • https://zujituxo.weebly.com/uploads/1/3/2/6/132681889/mimunajem.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499282/normal_600e87e3aabe3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376125/normal_6022572e5d08d.pdfIn PDF document text
    • http://kyrgyztours.com/wukurapovugunitofulagujfi.pdfIn PDF document text
    • http://tameeniraq.com/fluid_mechanics_physics_wallah_notes6n1ym.pdfIn PDF document text
    • http://dragonflysagewellness.com/pawexqs0hx.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486984/normal_5ff2971262b99.pdfIn PDF document text
    • http://jekeluxuto.mywebcommunity.org/how_to_explain_the_sun_and_moon_to_a_child.pdfIn PDF document text
    • http://gakmancreatures.ru/fireworks_sound_effects_freeprvz0.pdfIn PDF document text
    • https://vinovebavelugis.weebly.com/uploads/1/3/1/3/131383284/592510.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/0fe70c56-55d9-4108-88c8-3d0edf4f379a/mizawiboxopubolesu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1eb4cc7f-6cd1-49b8-9140-a856caaf67a3/mathematics_textbook_grade_12.pdfIn PDF document text
    • http://kaxuwenewutexu.myartsonline.com/motorola_sbg6580_factory_reset.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_off0000e6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6DA 5428 bytes
SHA-256: ab16875b08c3fbfb0ecfa21670c27bca8aa3521449c2a745c1a3d63facf25bb8
font_01_sfnt_off0000f94a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94A 10184 bytes
SHA-256: 1143153de35b01ab3115590cc8a1e08121f692da02e41614cacfc699e0794ec0

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