Malicious PDF — malware analysis report

Static analysis result for SHA-256 b770608ac157bd29…

MALICIOUS

PDF

82.4 KB Created: 2021-06-07 01:05:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1b220d625d162b2b8b9714ea31d60060 SHA-1: f61ac5a469ae3aded6249a5886b97012c5180821 SHA-256: b770608ac157bd2947de59ab483200fd6043d2225f078c8b127c6286522304b3
126 Risk Score

Malware Insights

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

The file is a PDF with a high ML classifier score and ClamAV detection, indicating malicious intent. It contains an embedded URI pointing to a URL that uses a common phishing lure related to popular search terms. The PDF also functions as a link farm, with many embedded URLs, suggesting an attempt to obscure the malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://pixomot.ru/pbw?utm_term=bridgerton+season+1+episode+6+cast PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4495402/normal_5fd66ae757100.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459188/normal_5fdd4a315ac13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467589/normal_600bd844040e8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_6001bea23edad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499633/normal_6030e8d1b1c75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419198/normal_60326d10d886f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497079/normal_60296c342ad39.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_6037462d000dc.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tovemubu.pbworks.com/f/92262154865.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ea19900e-b386-4e0b-9021-f581a746c3a6/mutants_and_masterminds_trove.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b09b3269-dd1e-45c7-a2b0-97549c1b920f/rirokapaxet.pdfIn PDF document text
    • http://bezidoxumoru.pbworks.com/f/pubg_mobile_score_system.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f55a5266-df3b-4e3f-a5b6-b1c65dcb5fa2/xakeralekejavo.pdfIn PDF document text
    • http://lakejidumap.pbworks.com/f/nudezajolomixujosojos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1fcd129c-429f-48aa-93f3-761c3973a2a2/how_to_make_a_simple_gift_bow_with_ribbon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abc67f7e-aca2-4bb0-a3b1-ebf8c338c66e/oracle_19c_virtualbox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/332831ec-27dd-423c-a3b8-b4411d8c9251/44754813733.pdfIn PDF document text
    • http://sikovifif.pbworks.com/f/fumofojes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/615d0f79-48c6-4d6e-89d7-a377b2f2710a/58531412047.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09ff89c9-d6d7-4d42-8182-32cf2454860b/dell_xps_8300_graphics_card_compatibility.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/381e783d-372f-42a5-aa23-a05d98811634/7336569465.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1bd46a6-bf69-420e-9c08-998d2315e341/94513050998.pdfIn PDF document text
    • http://gurilotav.pbworks.com/f/navabime.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_off000102a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102A4 5464 bytes
SHA-256: 745e697ae2846876540bfd8b9fc1887b62471f8dd482b501b85a5997adfad8b1
font_01_sfnt_off00011553.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11553 11496 bytes
SHA-256: d0f4c79b28fd573d67d209ea36caffb619a7d29fd5e5a28382e69ff77ffd4950

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