Malicious PDF — malware analysis report

Static analysis result for SHA-256 03c6a4dc5b14df60…

MALICIOUS

PDF

79.0 KB Created: 2020-11-28 14:23:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 01eac17040fb5ca1eb7db3391341ce37 SHA-1: 2cb22f8a96a4573e3157897238354ae3f68f69c2 SHA-256: 03c6a4dc5b14df607b43b3af7d99b6da111fb507c16733fa391504fb65339770
164 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://trafffe.ru/strik?utm_term=italian+a+self-teaching+guide+free+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4404515/normal_5fa9e1877155b.pdfIn PDF document text
    • https://gojemafofapuvog.weebly.com/uploads/1/3/2/6/132681271/7359286.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416934/normal_5fb80cbf42920.pdfIn PDF document text
    • https://deketonozalupu.weebly.com/uploads/1/3/3/9/133997688/5d4f72.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/4647df8d-48d6-46f6-b23b-e54dd9935e2f/gudevejoviwuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70f92df9-1aba-4afa-8108-91a53c320dea/amber_avery_facebook.pdfIn PDF document text
    • https://s3.amazonaws.com/lixuduwonifa/certisign._com._br_certificado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/259520ec-7594-4600-81aa-c6b7536e121a/1713597245.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1916ec99-98c8-4ba5-a877-5f375a07fed4/86506175659.pdfIn PDF document text
    • https://s3.amazonaws.com/wilugugo/sigogubanepovuwebofov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b12a45-7f56-4e23-8757-3c3e6e4ee586/wugiferela.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6001980-0069-4287-8eee-8f99052629b7/fulirisaduxunujeni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba684e61-c337-438b-93dd-386cca73731e/61124313427.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26a82680-7c26-499a-8c5c-a36464393b33/50621143466.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/00743ba2-2a71-4b17-82bd-c353b592f0a5/puzizika.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/4153300093.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/cisco_ess_2020_password_recovery.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00011163.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x11163 18392 bytes
SHA-256: c0a618a945db395ada244af5894f2be878b946ceaa8d0450d747875e5177c2a8
font_00_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 2940 bytes
SHA-256: f289a6ce550475b65d0c7bf960fb4c96b8e95ead31aac25434e9c7918c1afce4
font_01_sfnt_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 5384 bytes
SHA-256: 214dc90ea7c21eb9b0af78ac10bd1e9169d8df9b71b68b7d0617981c7fa56533
font_02_sfnt_off0000e7a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 12528 bytes
SHA-256: 2b629bf91dffef809843aef712391438e2fd0c2d5fde2c8400940f65ec8877d6

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