Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5981951bc3ac76…

MALICIOUS

PDF

120.8 KB Created: 2021-03-14 21:14:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e7d01e6a3a4c1939628b2c1252d52177 SHA-1: dea7e32c9d89a301a7a3ccbf036d95dab630dc62 SHA-256: 3b5981951bc3ac76f67c75e5b90c5cc84b943bfe236f757e6498b318f2024c0a
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains text related to search engine optimization and website keywords, further supporting the link farm hypothesis.

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=where+is+the+savage+reservation+located PDF link annotation
    • http://my-favshopc.online/wiziwasojedanavdvqm.pdfIn PDF document text
    • http://testrun.ru/tuzerurulefcb21.pdfIn PDF document text
    • http://fdvsefwfrw.space/bootstrap_4_admin_dashboard_templatesr63id.pdfIn PDF document text
    • http://tomandbxof.site/53828939486j0vtn.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/Tia0haa/dadefasoworofegumopup.pdfIn PDF document text
    • https://cdn.sqhk.co/reromiwo/ieiEjba/jefupif.pdfIn PDF document text
    • https://cdn.sqhk.co/jutafegobexe/UgcifuX/91295343309.pdfIn PDF document text
    • http://legalvictory.group/411484157434ug0f.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/6ib0sii/original_words_to_ice_cream_truck_song.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vadibezodaxilez.rf.gd/ironman_70._3_waco_athlete_guide.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_83f18e8b76374b30a6427f8f3b7dc8b5.pdf?index=trueIn PDF document text
    • http://lujemibezigan.epizy.com/national_song_of_pakistan_free.pdfIn PDF document text
    • https://77a80da1-97a3-4b40-ba11-54c6d232eb66.filesusr.com/ugd/39a0fd_9224c3c42de949e5ba03a8ea4be05e51.pdf?index=trueIn PDF document text
    • http://vopapokolozanum.rf.gd/maine_pyar_kiya_video_songs_3gp.pdfIn PDF document text
    • http://lonivone.rf.gd/2007_aha_guidelines_prevention_of_infective_endocarditis.pdfIn PDF document text
    • http://bulupuzu.epizy.com/ajay_yadav_anesthesia_download.pdfIn PDF document text
    • https://b20aee1f-b1b7-4e4e-be5e-d884e4ece670.filesusr.com/ugd/10e3af_eb0c76d3cd8d45e1bb20943f69379ae2.pdf?index=trueIn PDF document text
    • http://nerozufigepa.rf.gd/nitecore_charger_i4_not_charging.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018bd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18BD6 5060 bytes
SHA-256: bc97f839bafaffd922b28855b4238ef4810c8a3857db8a45797dcc444e3ba560
font_01_sfnt_off00019d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19D0B 12584 bytes
SHA-256: 4f1f9cca3224d8855f9d84b8dfbffb53981b4c4e47b83e51a5c51431d50645b6
font_02_sfnt_off0001c5d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C5D2 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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