Malicious PDF — malware analysis report

Static analysis result for SHA-256 40917dd8fb67d5e5…

MALICIOUS

PDF

112.7 KB Created: 2020-11-16 15:35:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: da22f617415db78aa577212576a73c39 SHA-1: dd5261a079784143efc7baacca4d6110ff05815e SHA-256: 40917dd8fb67d5e545f3672c92c1ab5c29f61c9ed26d9f72c021da8e2c6cd0db
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 0.9994

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 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://trafffi.ru/123?utm_term=vampire+knight+zero+voice+actor+english PDF link annotation
    • https://kokexofagisukop.weebly.com/uploads/1/3/2/7/132710589/dozusawofip_gadekinukekiwop.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/2598e621-2118-4998-aa59-4e93f7dc0c05/nivavovubuw.pdfIn PDF document text
    • https://s3.amazonaws.com/didowugorokirug/zeretugatirizi.pdfIn PDF document text
    • https://s3.amazonaws.com/simujix/cox_tv_guide_lafayette_la.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0fcb1ba-5f2c-48ac-bbfe-512047d4c4d9/los_elementos_de_la_comunicacion.pdfIn PDF document text
    • https://s3.amazonaws.com/lanubili/pathfinder_kingmaker_chill_touch.pdfIn PDF document text
    • https://s3.amazonaws.com/tefelaj/vaboxarilidezovugiw.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/night_women_short_story.pdfIn PDF document text
    • https://s3.amazonaws.com/rimepusox/queen_gambit_books.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/bestiario_lovecraft_descargar.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/zuxasesasav.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15467 2900 bytes
SHA-256: 68d094faf81d2ea9f62e68ee4e789e40b6192f27e323b9e50c58fbaa8f881837
font_01_sfnt_off00015eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15EAA 5488 bytes
SHA-256: fe106e5723b1b10590b2273f5093a7730ed8638003ce885967e5044410900418
font_02_sfnt_off00017144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17144 14800 bytes
SHA-256: 66dfc2731be8fa3229753bfe8238352d62b9c6ff72ffeafcc2fff69813f9ec7c
font_03_sfnt_off00019fa8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA8 16204 bytes
SHA-256: 0318b400cbd4eb80818b7eb131bcca2e18f343f850c5eb1573e525fea31f4d56

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