Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dc973725384fcdd…

MALICIOUS

PDF

76.3 KB Created: 2021-02-28 21:23:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: e2d31aa9f8219bfcfba3ae63ec7fc09d SHA-1: fb24a2d3db958f17c5abeeb74dd874d1021ef9a8 SHA-256: 3dc973725384fcdd6aa523e1ab1e246b4b6da44691d736acc915e0c86790df78
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are SEO-optimized and point to other PDFs, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and external links are indicative of malicious redirection.

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://leonvi.ru/wix?keyword=how+to+select+multiple+photos+on+mac PDF link annotation
    • https://cdn.sqhk.co/surodamiz/7of4cia/jevokavomasatarivelufut.pdfIn PDF document text
    • https://cdn.sqhk.co/gulaxemetila/jhjfUha/69063290984.pdfIn PDF document text
    • https://cdn.sqhk.co/bamebuxi/gheWkEM/how_to_adjust_screen_timeout_on_iphone_6.pdfIn PDF document text
    • https://jisixeda.weebly.com/uploads/1/3/1/4/131409884/1564057.pdfIn PDF document text
    • http://allmedbook.com/basic_english_grammar_exercises_for_beginnerslzm93.pdfIn PDF document text
    • https://todilotifobaw.weebly.com/uploads/1/3/2/7/132712516/robujisaxumiz-xogelexifi.pdfIn PDF document text
    • https://cdn.sqhk.co/zifeduwa/lYhgjbb/nudoju.pdfIn PDF document text
    • http://zupibupiju.iblogger.org/carbon_copy_cloner_beta.pdfIn PDF document text
    • https://pulisojoperun.weebly.com/uploads/1/3/4/4/134487891/bulavibepoxatiz-vexubadem-xofepasojipon.pdfIn PDF document text
    • https://satufimitu.weebly.com/uploads/1/3/4/7/134715308/6916652.pdfIn PDF document text
    • http://rasprodavaika.ru/surat_akreditasi_ban_pt_undip39ocd.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/wuniku/what_is_a_good_meat_slicer_for_home_use.pdfIn PDF document text
    • https://s3.amazonaws.com/popilo/how_to_take_screen_snapshot_on_android.pdfIn PDF document text
    • https://s3.amazonaws.com/fovezewi/lozinugidizike.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/all_english_regular_and_irregular_verbs_list.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/timex_1440_sports_watch_battery.pdfIn PDF document text
    • http://palakojum.rf.gd/biduzilusobedosizazater.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/wajig.pdfIn PDF document text
    • https://s3.amazonaws.com/turip/creation_crossword_puzzle_answers.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_off0000ef78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF78 5132 bytes
SHA-256: 85d91bb1df8714a1fde02a3fa8478b92bd4b6d815c7369f940d4bed447e4fd39
font_01_sfnt_off000100d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100D6 10196 bytes
SHA-256: 4aa88686ad155dec2b7bae5e2912d78b423d6a1f2e96f0264b827f32a2f75fe5

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