Malicious PDF — malware analysis report

Static analysis result for SHA-256 23ea1318e41f87ea…

MALICIOUS

PDF

73.5 KB Created: 2021-05-22 21:09:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 118f9da42bc1be700b881e802b982fea SHA-1: 6616829abcec10ca51ee472187d5db8515438374 SHA-256: 23ea1318e41f87ea6a0236b410c414d50e5f22e4c06adaf58d0ccae380e9f1d0
196 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to Weebly and other hosting services, suggesting a link farm or distribution point for malicious content. The heuristic 'SE_PASSWORD_ARCHIVE_LURE' indicates the document may be a precursor to a password-protected archive, a common tactic to bypass gateway security. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://nipisod.ru/strik?utm_term=como+compartir+una+carpeta+en+una+red+lan
    • https://natutiwuv.weebly.com/uploads/1/3/6/0/136019317/2f926d32f8b92f.pdf
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ff2d8f5862f0.pdf
    • https://revugegan.weebly.com/uploads/1/3/4/6/134682990/vegexol.pdf
    • https://static.s123-cdn-static.com/uploads/4366359/normal_5fcaf1bb9401a.pdf
    • https://duxataravur.weebly.com/uploads/1/3/4/0/134017775/kezilorakeg_zinafudem.pdf
    • https://cdn-cms.f-static.net/uploads/4443372/normal_60188dbb9a2a3.pdf
    • https://cdn-cms.f-static.net/uploads/4384167/normal_6035531564b0f.pdf
    • https://vaxunupix.weebly.com/uploads/1/3/0/7/130775436/2535402.pdf
    • https://xogukozatakik.weebly.com/uploads/1/3/1/4/131453421/milexowafa.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/luramamelolem/sedentary_animal_form_crossword.pdf
    • https://uploads.strikinglycdn.com/files/06e0104c-a899-4c39-84c6-dfca7a674c24/67754625079.pdf
    • https://uploads.strikinglycdn.com/files/1c61d748-0677-4546-96ab-a5ab6b51d9b9/snow_white_and_the_huntsman_2012_filmyzilla.pdf
    • https://uploads.strikinglycdn.com/files/ebcde8c5-8294-4733-a10b-f1b7d8c9bd27/porter_cable_4210_dovetail_jig_video.pdf
    • https://s3.amazonaws.com/vatakefojunib/75518949435.pdf
    • https://s3.amazonaws.com/zategafozasiru/angular_5_tutorialspoint.pdf
    • https://s3.amazonaws.com/xufujofaleki/5358074604.pdf
    • https://uploads.strikinglycdn.com/files/af68311d-e041-4024-9a4f-51b60de16a6c/the_road_less_traveled_poem_meaning.pdf
    • https://s3.amazonaws.com/jazuravazaguz/52664851554.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df1b.bin
9fc36f54cbc5f6846b81cc3957ff91305d70282011553e81d90a43781a709d2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 4948 bytes
font_01_sfnt_off0000efd7.bin
f79a1c9f38becc2d6eef4dc6e8e7aad9dc8dd06c70c5343a04d7453f7f17868f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD7 12040 bytes

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