Malicious PDF — malware analysis report

Static analysis result for SHA-256 79cb73d12b1f9321…

MALICIOUS

PDF

73.7 KB Created: 2021-02-23 00:46:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: fe0d92ebb5abcc1fe1fdeb703cbdc027 SHA-1: 5efe1b2e5a865dec5c7f0c19c3bb9088fa0aa16d SHA-256: 79cb73d12b1f93214a866fa586708d4f49672b06e02b0a7e49292bd9790989f9
66 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the link farm heuristic suggest an attempt to redirect users to malicious content, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=what+is+the+theme+of+the+dinner+party+by+mona+gardner PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4501214/normal_60312dd338048.pdfIn PDF document text
    • http://falutaburifa.iblogger.org/ccna_lab_manual_2018.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369760/normal_5ffa73bae44b5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389599/normal_5fcfe84932650.pdfIn PDF document text
    • http://tiktoktop.design/graco_click_connect_car_seat_installation_instructions0hbhi.pdfIn PDF document text
    • http://helper-badges.com/kaxoxutuxetexazamuvuvjvqpz.pdfIn PDF document text
    • https://cdn.sqhk.co/xonivozew/hdidVji/26502915084.pdfIn PDF document text
    • https://cdn.sqhk.co/nowavutu/phfjfPs/download_music_mp3_app.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418379/normal_5fd1c096e6644.pdfIn PDF document text
    • http://giftcard-sale.store/nexatazikalebuzixitegujaf5pk5b.pdfIn PDF document text
    • http://robot3.site/gobavonegipfxkh.pdfIn PDF document text
    • http://porn77.design/29018094802u4v8t.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://s3.amazonaws.com/belopudevuzuza/3533284773.pdfIn PDF document text
    • https://s3.amazonaws.com/jozaponi/16491881623.pdfIn PDF document text
    • https://s3.amazonaws.com/wifiduxezo/sedovilexalunasa.pdfIn PDF document text
    • http://zasemamol.rf.gd/57236039223.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_off0000d5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C4 5464 bytes
SHA-256: 384b1d584270cfa0db5e8289cf76010dc395cc3508d7d1f94eb080b43f0301cb
font_01_sfnt_off0000e845.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE845 10192 bytes
SHA-256: ee54c9777d06acc7b966f9f3e2c6b7dab3c79f9fe28c35249975290372fcf012
font_02_sfnt_off00010ad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD7 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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