Malicious PDF — malware analysis report

Static analysis result for SHA-256 43299fef2daa373e…

MALICIOUS

PDF

81.6 KB Created: 2021-03-02 22:09:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: ab924a8f6bc2e5d94c76624ad34e05fd SHA-1: a9cc1d16387260bfe4a00aebdf02a15e4a1d5aa1 SHA-256: 43299fef2daa373e9683ff15748f142e4ac3f0e2da1c2ae3fb94f139e66e1b61
156 Risk Score

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://bologen.ru/strik?utm_term=carry+on+bag+with+laptop+pocket PDF link annotation
    • https://gogadumipoti.weebly.com/uploads/1/3/1/0/131070618/55c723f059.pdfIn PDF document text
    • http://gatiseb.22web.org/how_to_find_basic_probability.pdfIn PDF document text
    • http://znalomstvavip.site/518152589130xno2.pdfIn PDF document text
    • https://guzarederojem.weebly.com/uploads/1/3/4/3/134392385/5821057.pdfIn PDF document text
    • http://creamwalls.online/6370844952062jny.pdfIn PDF document text
    • http://dowelatevitik.22web.org/ahuyentar_avispas_de_forma_natural.pdfIn PDF document text
    • http://kijofizovurisos.medianewsonline.com/3529598191.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/wenevadozuwuro.pdfIn PDF document text
    • http://tobufupevujuma.mygamesonline.org/biology_lab_report_format.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/memexelu/dolagibunudajezawu.pdfIn PDF document text
    • https://s3.amazonaws.com/kevava/50251076591.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/emotional_love_status_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/65236564397.pdfIn PDF document text
    • http://sikejilewiz.epizy.com/brlps_answer_key_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/jujadodedaruxix/dowolemibisajepituwud.pdfIn PDF document text
    • http://gedatedemokuju.epizy.com/big_group_hug_request_form.pdfIn PDF document text
    • https://s3.amazonaws.com/gogoxowiniza/nezodi.pdfIn PDF document text
    • http://bifiwapaz.onlinewebshop.net/appliance_spare_parts_store_near_me.pdfIn PDF document text
    • http://bovubodomumid.epizy.com/bokezonurivijakenarefu.pdfIn PDF document text
    • https://s3.amazonaws.com/woxorojero/digestive_system_worksheet_3rd_grade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 5320 bytes
SHA-256: fefde3a8e25ff564b9bc3cb15017d13d81f95cfae5dafe09feb2482a62943f49
font_01_sfnt_off0001147c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1147C 10672 bytes
SHA-256: a80e4dd27daa6066fb4b79a360af4064a69bbbee452b348690b995dc615f1d1c

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