Malicious PDF — malware analysis report

Static analysis result for SHA-256 be8551e0254c9bde…

MALICIOUS

PDF

81.0 KB Created: 2021-03-19 06:06:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 65cbf354343f5da663e83042060dcb31 SHA-1: 9cddfddf113249ca858b504589a96f374a30cb84 SHA-256: be8551e0254c9bde0d540167b59cfcf91b6923e4724791dab1c974771c6aec4e
186 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 0.9994

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://jottigo.ru/award?keyword=apa+style+of+referencing+example+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415770/normal_5fccc5606217c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366398/normal_600f905243536.pdfIn PDF document text
    • https://xesofizagib.weebly.com/uploads/1/3/4/4/134491847/7737623.pdfIn PDF document text
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/kagebikisonik_lizexaridijivam_sebimelatopawog.pdfIn PDF document text
    • http://inscarusa.info/whirlpool_cabrio_dryer_error_codeskkcht.pdfIn PDF document text
    • http://meetchambre.xyz/astrology_for_beginners_william_hewittytrnm.pdfIn PDF document text
    • https://tifegoguxefufi.weebly.com/uploads/1/3/1/6/131637953/lagomon_pijejanijiva.pdfIn PDF document text
    • https://fanavepuru.weebly.com/uploads/1/3/1/8/131871984/biluwuwej-kifupotapema.pdfIn PDF document text
    • https://notuvovezed.weebly.com/uploads/1/3/1/3/131382721/875794711d41a4c.pdfIn PDF document text
    • https://wonikisemuk.weebly.com/uploads/1/3/4/9/134902350/diluwomom-kenoti-wixoke-sixupiful.pdfIn PDF document text
    • http://insurancecarusa.com/the_future_of_life_wilsonqgc5o.pdfIn PDF document text
    • https://wajotirege.weebly.com/uploads/1/3/5/3/135306859/xirinijolawoka.pdfIn PDF document text
    • http://help-igcopyright.xyz/31641009971ytrcj.pdfIn PDF document text
    • http://batut.space/fepimirokidexoxupejorobelvno8r.pdfIn PDF document text
    • https://jixawapideraje.weebly.com/uploads/1/3/3/9/133997308/kelepanope.pdfIn PDF document text
    • https://pefesasorib.weebly.com/uploads/1/3/5/9/135972127/af1bda07f0979d.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/tanikanaw/free_html_website_templates_for_photography.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c282bfa3-c6ae-49fd-9f74-a7516bb27210/1962628115.pdfIn PDF document text
    • https://s3.amazonaws.com/domegagowevag/what_is_computer_network_hardware.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3af6ccf6-8779-4299-af91-e6fd09bb1e34/93360024326.pdfIn PDF document text
    • https://s3.amazonaws.com/jukoxisojow/psd_template_cv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/94f1b087-e9ac-4cb0-bf41-d56650e93ecb/dowisevupuwijobovexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963811c1-3d66-4371-9a12-7ae6f86c17d3/43301490913.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_off0000fe69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE69 5636 bytes
SHA-256: 56a37f4140f7c7950aa39ad4f677f1871ac9a01662f83af56bb06167ace50894
font_01_sfnt_off00011195.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 10900 bytes
SHA-256: a44c4f5e2777b96ea61cd9fc8245230a1d0d5251831db71c86c5529f12863cc9