Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd56dd4012c1a93f…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 09:50:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 290e699ba5b2a171d747d184c1e4941b SHA-1: 4afec2eb1949f9292ea04f488bae0963b599f532 SHA-256: cd56dd4012c1a93fc989e81c336445b9b98da99eb5a0f40195bf2ddd3b229f3d
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains heuristics indicating it is a link farm and a credential phishing lure impersonating UPS. The embedded URL 'https://resalured.ru/wix?keyword=test+cross+genetics+worksheet' is hosted on disposable infrastructure and is likely used to redirect users to a malicious site. ClamAV also detected the file as 'Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0', further confirming its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://resalured.ru/wix?keyword=test+cross+genetics+worksheet.
  • 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://resalured.ru/wix?keyword=test+cross+genetics+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4405907/normal_6004fe7e4a790.pdfIn PDF document text
    • http://rezotu.xyz/modern_poetry_books_like_milk_and_honeyg8t4q.pdfIn PDF document text
    • http://arenda-comp.space/5187793524ye03k.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvebopeweb/Tijijgg/39504633381.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462992/normal_600e9ffbd749a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370077/normal_60120bffcb0b6.pdfIn PDF document text
    • https://cdn.sqhk.co/xeloxilava/KiMEiiK/dasuluvasul.pdfIn PDF document text
    • https://cdn.sqhk.co/veletafi/jAIPsJE/zoho_social_nonprofit_pricing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381532/normal_601d5af2e8b00.pdfIn PDF document text
    • https://cdn.sqhk.co/wexovezojab/iAthagg/fonapobizez.pdfIn PDF document text
    • http://reduslim-italiaoficial.site/can_i_mail_a_package_via_usps_from_homek18em.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd308b7c2fb3.pdfIn PDF document text
    • https://cdn.sqhk.co/wujozuzewed/whbzjjd/totabakepibusikajinivolo.pdfIn PDF document text
    • https://cdn.sqhk.co/rogapakaler/fjjM6DV/46099618482.pdfIn PDF document text
    • http://tertov.xyz/biodiversit_vgtale_cours5xxg2.pdfIn PDF document text
    • http://dk-inc.xyz/interactive_dynamic_earth_test_answersh0kx2.pdfIn PDF document text
    • http://uscovidcharts.com/1622772464an7t9.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/7lKhijb/clash_of_clans_game_coc_private_server.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1fa8740-e4a9-41ac-bf0e-5a25bc67a8f9/31465583074.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181e1c39-ccc3-41a7-9c98-0cf1a849fe9b/javagiwewokitibi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d92196c-1fcc-49bc-973b-64e302f533d4/95209499367.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68121060-8aad-4dd6-b03e-0237a07b46c6/toyota_corolla_maintenance_required_light_blinks_8_times.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65b5106c-6944-40a6-891e-c3a7ac329ea7/god_is_not_one_stephen_prothero_free.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_off0000f312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF312 4924 bytes
SHA-256: 433984858d8ad2647028f43c1009843aec67b699ddfb179077d8421d5469cca4
font_01_sfnt_off000103e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103E7 10628 bytes
SHA-256: 041a8a279fe437a205afd27e8afb5d43f135659fe47bd3dbc4082ce33af2e96f