Malicious PDF — malware analysis report

Static analysis result for SHA-256 045309e2d1deed55…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 20:05:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: fbb397075c9eb83689f34e0a2bccd43a SHA-1: 5041e7a495ebde4319112cf32f2875cc9ff18c20 SHA-256: 045309e2d1deed55a1a8ce679e6f9f30528e38b73716ef43cff9d4b89253eee2
194 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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 7

  • 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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/award?keyword=january+2020+current+affairs+pdf+adda247 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473415/normal_604ca221ec127.pdfIn PDF document text
    • http://vikiduxa.mywebcommunity.org/tuxevixikuzirowujobipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471082/normal_6032feb2923af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460255/normal_602c7486f3bc7.pdfIn PDF document text
    • http://spainsale.pro/houghton_mifflin_english_workbook_plus_grade_7_answer_keyxe46p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381751/normal_601dc944992c3.pdfIn PDF document text
    • http://x-bionic.shop/lixeledugaloxasomiwekamagry7au.pdfIn PDF document text
    • https://wexapifunoru.weebly.com/uploads/1/3/4/7/134715363/6e04c940c4.pdfIn PDF document text
    • http://xploitcrew.io/car_gear_shift_not_workinguri6c.pdfIn PDF document text
    • http://salonhq.xyz/batewiregezejajelevoxef3fdzv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427293/normal_5fda9683dc055.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/74d2b4bb2648ef4.pdfIn PDF document text
    • https://xinejusitap.weebly.com/uploads/1/3/4/6/134630468/sipiwumagerode.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/rokuwapesu/fox_13_news_traffic_reporter.pdfIn PDF document text
    • http://loxupobupibim.atwebpages.com/oceb_certification_guide_business_process_management_fundamental_level.pdfIn PDF document text
    • https://s3.amazonaws.com/rojalexipokadaz/28127527049.pdfIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_feed1a88dfa6490fb94b2679be3ff63d.pdf?index=trueIn PDF document text
    • https://8d275f60-8e36-4e70-8574-b6d542a617c4.filesusr.com/ugd/dbf6c2_ea8aabe72e014e4ca5c6663a8dc0d595.pdf?index=trueIn PDF document text
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_53e4c36bcabf44abb817810c264b2797.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fupanabivote/mutimisene.pdfIn PDF document text
    • http://memamawu.onlinewebshop.net/appsc_previous_papers_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/editable_christmas_card_template_free.pdfIn PDF document text
    • https://5c2cca0d-3a4e-48b0-93bf-8ac6c0c026cb.filesusr.com/ugd/271e65_57227b7aa9d04eb1b777873ba5d80856.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vokeri/avakin_hack_apk.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_off0000fb74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB74 5652 bytes
SHA-256: 792207b51ded694719e3dc4cf3a34bfc0a06455d248773b505ca5f7e10b6335b
font_01_sfnt_off00010edf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDF 10936 bytes
SHA-256: 5d894bbe301a1a82d3462583d51f8f9ed05175fb3043f80ad557ce198b26427a
font_02_sfnt_off00013463.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13463 2844 bytes
SHA-256: a2aca8dbb2f10b94b757ebb22e45287a79537c06a8c3e714b288311426f57cc4