Malicious PDF — malware analysis report

Static analysis result for SHA-256 473e6fa4783c095f…

MALICIOUS

PDF

79.9 KB Created: 2021-04-15 06:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 22853301ab264ac282cae89aec1abb6b SHA-1: 72612cc762b632bf8106a9347e9ef9d3e998cbda SHA-256: 473e6fa4783c095f367ed63ed28db73549fdd9ebbe9ea7cf111ed5dacb26d554
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF file flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, with a high-priority heuristic identifying it as a link farm on disposable hosting. One of the primary URLs, 'https://baarspo.ru/strik?utm_term=la+odisea+personajes+primarios+y+secundarios', is likely used to redirect the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://baarspo.ru/strik?utm_term=la+odisea+personajes+primarios+y+secundarios PDF link annotation
    • http://xapepinozex.22web.org/oedema_in_pregnancy.pdfIn PDF document text
    • https://cdn.sqhk.co/wivodojeg/jixgdhh/imovie_slideshow_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/hicoehg/wubekuduzevuwojibefolasom.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/dhIjbgd/download_apk_nfs_heat_for_android.pdfIn PDF document text
    • http://mamunetosi.iblogger.org/wekexofosuruduwoninag.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://libaxobadu.epizy.com/8511640215.pdfIn PDF document text
    • https://s3.amazonaws.com/sesijesule/how_to_transport_sole_f80_treadmill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0296404f-52af-40b0-81e6-b77eac9e4689/davanome.pdfIn PDF document text
    • https://s3.amazonaws.com/mexijegedakol/ludebejelowopejiwa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31df5f25-9526-403f-ac26-71efe01da5f0/romonafakoxor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb87cd4e-14f8-4c62-8bd9-3ac504958819/wineladiveseni.pdfIn PDF document text
    • http://zexozanut.rf.gd/christmas_card_template_photoshop_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/507d6086-0d53-4168-88e9-e7b93580e5c2/compare_basic_differences_between_greek_and_roman_theatres.pdfIn PDF document text
    • https://s3.amazonaws.com/likerajatob/tefulefonifam.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/brazilian_jiu_jitsu_techniques_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/44642241501.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e71c4697-25d9-498f-88d5-c060372d8f01/5397093913.pdfIn PDF document text
    • http://wuxekijonudi.epizy.com/format_of_sales_executive_cv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77f94aa5-f962-465b-b6fd-2d8d72d9812d/69430419703.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_off0000f784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF784 5304 bytes
SHA-256: 8416866aece776a0e6e7d5dd9dd2c99eb436c696dee51d23449fe555fa407c8d
font_01_sfnt_off0001098e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098E 12232 bytes
SHA-256: a1b9333dd59fa3c1d888008cad582625c9daf3ffe1a4d50450aed826c1c24cfc

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