Malicious PDF — malware analysis report

Static analysis result for SHA-256 122dc1ab1bcfb49c…

MALICIOUS

PDF

68.4 KB Created: 2020-11-10 05:55:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: c6e61b2cc26de27878e7bf0e79321543 SHA-1: 53bb95d39aea2458983d43ebe97d7990a69932a6 SHA-256: 122dc1ab1bcfb49c31df573eb9e787b251de8644c5b2df0a4da0482dc549c368
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 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffine.ru/123?keyword=yahoo+mail+login+inbox+mail+messages PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4379236/normal_5f9282815bad4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449615/normal_5fa9e99666571.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f8b51f4d7f5a.pdfIn PDF document text
    • https://tivurenufetoza.weebly.com/uploads/1/3/4/2/134235987/vuluruxuvinekiwudiju.pdfIn PDF document text
    • https://munujagafunudo.weebly.com/uploads/1/3/0/8/130873736/pemate.pdfIn PDF document text
    • https://jufaxexave.weebly.com/uploads/1/3/0/7/130775513/dukuz.pdfIn PDF document text
    • https://siregudak.weebly.com/uploads/1/3/0/7/130738759/711678.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/f7e010fe-516c-4c61-8873-5a931c8921ed/gebolojates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac26d0de-2deb-4998-8aea-34d23dc68906/unblocked_minecraft_games_for_kids.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d651de7c-4e34-4aab-a068-ace03d8c4f90/ingredients_for_anointing_oil_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b174d503-4cfa-4976-882a-292227117b08/yamaha_v_star_1100_carburetor_adjustment.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a9a5e9d-b8aa-420e-9d17-ff09ce197f46/health_informatics_robert_e_hoyt.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c71d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71D 4880 bytes
SHA-256: 6f4a625d05c89d5c9fd1a47748f6f322e9a231b29b12907ee89426d2eabe7921
font_01_sfnt_off0000d78c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD78C 9148 bytes
SHA-256: acdea488100ddf9495aa2d73db44c11e163002294fd4eb3497b3a789e154ecc4
font_02_sfnt_off0000f6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6E9 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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