Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7bfdc0fbff6b47f…

MALICIOUS

PDF

106.5 KB Created: 2021-03-19 03:59:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a1cad7a609fd31bcb427ffa980d3633d SHA-1: 2176c48285655b1d5636330c2a0e21e29e076212 SHA-256: d7bfdc0fbff6b47f85429b2d1bf9ff355156b751c10ddc40243b31814852f1ad
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a link farm. One of the primary external URIs points to 'kuzutuzo.ru', suggesting a malicious intent to redirect users. The ML classifier and ClamAV detection strongly indicate maliciousness, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/award?keyword=best+company+profile+presentation+pdf PDF link annotation
    • https://newogofifexepe.weebly.com/uploads/1/3/4/8/134884114/3540761.pdfIn PDF document text
    • https://serinuvof.weebly.com/uploads/1/3/3/9/133997237/9988569.pdfIn PDF document text
    • http://ruxipivufaditij.22web.org/general_mathematics_10th_class.pdfIn PDF document text
    • http://opensucre.pro/kawolodoruzamaxesagekenpnoqi.pdfIn PDF document text
    • http://axacheat4.xyz/sobizasobuvaju2xlxu.pdfIn PDF document text
    • http://pl50off.info/graphic_designer_portfolio_templates_free_downloado8a6m.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/3176b267-bbe5-4bd0-8a48-85fd75e6e2e0/how_to_read_geologic_cross_sections.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9dd634a-9521-462d-8228-4f4adef91176/margin_of_safety_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/gonima/jinufesavizur.pdfIn PDF document text
    • https://s3.amazonaws.com/sefepugolupalax/story_robert_mckee_baixar.pdfIn PDF document text
    • https://s3.amazonaws.com/kefefetafij/osha_forklift_certification_training_video.pdfIn PDF document text
    • https://s3.amazonaws.com/wizakokowe/dlink_camera_blinking_orange.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b610412f-21e7-460e-b2bb-be9a1406a737/savenesojerazoxi.pdfIn PDF document text
    • https://s3.amazonaws.com/xetasif/hive_orc_vs_parquet_performance.pdfIn PDF document text
    • https://s3.amazonaws.com/gotitibekovi/24024753453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94a34ce7-0464-48e4-89e3-d47c5d280dc2/19836733888.pdfIn PDF document text
    • https://s3.amazonaws.com/vefagotoje/mowagufanazapulinoxudege.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c87dbd1-193e-4ac5-9fce-f6ef53f7cb98/in_the_heights_movie_uk_release.pdfIn PDF document text
    • http://zezazemana.epizy.com/3_digit_addition_no_regrouping_free_worksheets.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_off00015759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15759 5240 bytes
SHA-256: e3d38cf2a7515cf39ea61f804827926e8b6a1c999e5ea0636b1695c5bf2cdd33
font_01_sfnt_off0001690a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1690A 11024 bytes
SHA-256: 71b3a310bc2a3182d69756259df96b394268bba8e1828dd6c33a07955cd13c65
font_02_sfnt_off00018e98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E98 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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