Malicious PDF — malware analysis report

Static analysis result for SHA-256 b78d0f5cd785fc76…

MALICIOUS

PDF

75.4 KB Created: 2021-03-06 17:57:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 09884b687cc83443f009c0797f76307f SHA-1: 918b0f52e3b51d406cd95b288b6ab4ae252cc9d2 SHA-256: b78d0f5cd785fc765463bdd61106f4ff1f30e2cc6a41841e06cc8db2d72d9454
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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 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.
  • 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://zajinet.ru/strik?utm_term=what+is+verbal+communication+in+simple+words PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417653/normal_6033b3265a194.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421039/normal_601e217d35133.pdfIn PDF document text
    • http://uscreditinquiry.info/regejamojupavefegakjb86.pdfIn PDF document text
    • http://stebsmeh.space/les_miserables_broadway_cast_2014m3twl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452206/normal_604200815f3e4.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/guvovigo/maplestory_m_korean_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35334d9-c075-4e46-a8ac-7e59a368df5b/dojuzubunakekow.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d10c0de0-0256-4ed0-8a43-f10b69275e67/yaesu_ft_450_manual_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/gonafoziguwewe/alter_ego_b2_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/commercial_building_floor_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86448a51-186c-41e7-9005-a83197e2e274/kepanogagowadawidomaxafib.pdfIn PDF document text
    • https://183df7f2-4185-4ca0-bfcc-33b39bc842f1.filesusr.com/ugd/9ac34a_7c7e6af125004d7c92075c4c5374c395.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mogipegi/are_sunkist_fruit_gems_gluten_free.pdfIn PDF document text
    • https://s3.amazonaws.com/jovekus/lexus_es300h_price_in_usa.pdfIn PDF document text
    • https://f7f2eb1f-4ce6-40bf-b337-6bcc2c9c1a95.filesusr.com/ugd/dc6899_90dfc3fa097442acb0b0040b553f53eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/debiwelof/centre_de_formation_agent_d_escale_lyon.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/457ec027-38ea-4985-b2de-fe1ffe34ccad/rixunudipozededar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92387463-561a-4571-acde-0035434d13ba/william_faulkner_quotes_about_the_past.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_off0000e899.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE899 5620 bytes
SHA-256: d8ab27e9838dadb4dea949535f4adc31745fd81adae91f4270c789ad54cae085
font_01_sfnt_off0000fb9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9F 10672 bytes
SHA-256: c7f231b1103da8dddbf78421ed911ac8ba2ace1c9ad5bb963cb5d6112c1c67d6

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