Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5d4473a7c76b332…

MALICIOUS

PDF

73.5 KB Created: 2021-02-11 14:06:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 287be7545bdf5bd12904eaa32476d492 SHA-1: 44904ace4e42f2cbed71d5625992aa40e2ea02d8 SHA-256: c5d4473a7c76b33252a7776a61d2131b9c70904928fd5cba72d6fc2642aa0876
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://jottigo.ru/aws?utm_term=breakdown+english+movie PDF link annotation
    • https://wexubowepupewaw.weebly.com/uploads/1/3/1/8/131856394/mugofasipabuzo_tivafog.pdfIn PDF document text
    • http://herss.space/bowarenexunukunisazulopebb6enl.pdfIn PDF document text
    • https://rozazokosu.weebly.com/uploads/1/3/0/8/130813972/2bea638eee349b.pdfIn PDF document text
    • https://bugabomusajo.weebly.com/uploads/1/3/4/5/134509224/4483376.pdfIn PDF document text
    • https://varepanuror.weebly.com/uploads/1/3/5/3/135394497/55e13.pdfIn PDF document text
    • https://kurenilomu.weebly.com/uploads/1/3/4/0/134042522/wukavesitafuj.pdfIn PDF document text
    • http://mebelintera.ru/macroeconomics_20th_edition_download864wo.pdfIn PDF document text
    • http://beststudent.fun/perfect_piano_mod_apk_full_unlockedi2pkb.pdfIn PDF document text
    • http://thecabinets.xyz/xanagejimjox5z.pdfIn PDF document text
    • http://omerkatanalp.com/paint_chip_poetryi0cr9.pdfIn PDF document text
    • http://vk-settings-change.online/kaluz6ft7g.pdfIn PDF document text
    • http://anarchymedya.com/plants_vs_zombies_2_save_file_location_android9hp15.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/pokorevalaxex/antenatal_care_guidelines_acog.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/balance_sheet_account_reconciliation_process.pdfIn PDF document text
    • https://s3.amazonaws.com/rebesudanolo/gavepa.pdfIn PDF document text
    • https://s3.amazonaws.com/xufujofaleki/all_india_radio_news_app.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_off0000e1a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A9 5504 bytes
SHA-256: ccda37d0bd5bf0adab1f451393ef494439e64d698aaca7c28e3b1fc384837ff8
font_01_sfnt_off0000f451.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF451 10832 bytes
SHA-256: 29b323e4e3232b0ee875dcc995814179470334fda8ee1ff16ae5b7a757cb5050

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