Malicious PDF — malware analysis report

Static analysis result for SHA-256 04693ed981a27e1e…

MALICIOUS

PDF

90.3 KB Created: 2021-02-25 21:40:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: bca012e56abd1c705293997089a6b0d0 SHA-1: 05af9f9bba46c436c05dab33ed5866efcb4cefde SHA-256: 04693ed981a27e1e66684d43835470eff23a68c85f4ad5f332f7ef5114437c5b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be disposable or used for SEO spam. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically phishing or trojan distribution. While no scripts were directly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially malicious content or further stages of an attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://crophysi.ru/wix?keyword=assata+shakur+book+pdf PDF link annotation
    • http://itanah.space/tirenorufuzamarowemelowuk8rf0m.pdfIn PDF document text
    • http://instasale.company/to_do_list_printablenz2qj.pdfIn PDF document text
    • http://coolstudent.space/xipigozolipozarekahwocc.pdfIn PDF document text
    • https://cdn.sqhk.co/fejavegiwo/hTihAgf/26791279696.pdfIn PDF document text
    • http://trastqort.online/modern_mathematical_statistics_with_applications_2nd_edition_solutionswy8x5.pdfIn PDF document text
    • http://aov.one/cake_designs_for_marriage_anniversarycpf5x.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/PCmjfla/21108464740.pdfIn PDF document text
    • https://cdn.sqhk.co/rorajakura/gihVibJ/routed_slot_car_track_braid.pdfIn PDF document text
    • http://olymptrade.buzz/362309402380riqb.pdfIn PDF document text
    • https://cdn.sqhk.co/manaruparil/jfJTShb/us_history_quiz_34.pdfIn PDF document text
    • https://dajilifu.weebly.com/uploads/1/3/4/8/134891154/b722cea.pdfIn PDF document text
    • https://puduwuxibipufu.weebly.com/uploads/1/3/5/9/135966859/524d84881981.pdfIn PDF document text
    • http://lnstagram-help-businesss.com/rawiderumuresesagulipc07n.pdfIn PDF document text
    • https://cdn.sqhk.co/sovanoniwuva/hPibkgp/28046436433.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/golepe/zewakejogadakowudeteg.pdfIn PDF document text
    • https://s3.amazonaws.com/tugumeb/solidworks_2017_system_requirements.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/zuzesilinu.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/memubojarorizitakiwoda.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_off0001182d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182D 4900 bytes
SHA-256: afe5bb07e344e76020598db3bd5220ed83dd5ca5fbcb42879f87fe8b8209edae
font_01_sfnt_off000128d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D1 10804 bytes
SHA-256: 1567a70518974c803ba2513b4a6d781caf0e0ead911df7811593648ae1ad8ee6
font_02_sfnt_off00014de4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14DE4 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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