Malicious PDF — malware analysis report

Static analysis result for SHA-256 b56bb4a2a708a1e5…

MALICIOUS

PDF

89.4 KB Created: 2021-03-18 04:14:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 85b4db85e80019f6b9c9d04e9b3c125d SHA-1: b03f43d5d7a9fe19b9847daeb3a0700ba9859a9f SHA-256: b56bb4a2a708a1e55fd824dec1f66d8313f41abe18d46e1b1cb3ce9dff259ae1
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one identified as a malicious redirector and others forming a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or SEO spam. No scripts were extracted, but the embedded links are the primary attack vector.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=privatized+prisons+pros+and+cons In PDF document text
    • https://mizewipexu.weebly.com/uploads/1/3/4/6/134609608/jafovowapazi-vepelarubabe-sotabe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482854/normal_6022a29a510cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450336/normal_6023e94c96d87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451565/normal_600b013c29feb.pdfIn PDF document text
    • https://lerugusenexeke.weebly.com/uploads/1/3/5/3/135317851/8b3ef5fe7c9b.pdfIn PDF document text
    • https://kunulidozejenu.weebly.com/uploads/1/3/3/9/133997834/4ed10d7aabad21.pdfIn PDF document text
    • https://zukigepuzena.weebly.com/uploads/1/3/4/5/134593101/xuwotigopivalekaw.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474448/normal_5feba32650e5b.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/ae257003-d035-4c91-88a0-7886cb4d7595/willy_wonka_and_the_chocolate_factory_characters_now.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/48924641868.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/26909435646.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/pepawelemixibimitok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/055637b7-f68f-4ce9-8c2c-3d60138935b9/wasaxekidoxoregebexe.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/84563563754.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efc4ed7e-10c8-4d80-aa32-1b8e7fb95c2a/60779909627.pdfIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/past_form_and_past_participle_of_become.pdfIn PDF document text
    • https://s3.amazonaws.com/desekusoxi/how_do_i_convert_a_to_a_fillable_form_in_foxit.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/biology_cape_syllabus.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/99352259722.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/912e418c-48fd-467d-bf81-5e54a49cd615/cobra_microtalk_walkie_talkies_121_privacy_codes.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_off000120e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120E2 5148 bytes
SHA-256: c8a39e94db4993bce54ab047a17d5bb300fb2bd14730f72ea70f2139c8ba3dfd
font_01_sfnt_off00013281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13281 10960 bytes
SHA-256: 586ccb3bb6391650ff452d92d7814b62e9429b0c95455396ea4168df3a233a8a

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