Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bc8283990273513…

MALICIOUS

PDF

81.9 KB Created: 2021-04-04 16:33:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1d11de226fbbf4ae18c204c113f73602 SHA-1: 9e7420ea9df34d93cea02d23b801d81ad00d3348 SHA-256: 8bc828399027351313b226f6468e2280f7bfe157b8ee8e933de80d01895b6242
166 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a LOLBin command-execution lure. 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 0.9990

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://xezojetit.ru/wix?keyword=shop+heroes+mod+apk+revdl PDF link annotation
    • https://cdn.sqhk.co/salosegebomi/wIfc7jh/japusa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427300/normal_6026273bd9163.pdfIn PDF document text
    • https://cdn.sqhk.co/womafafowix/m8jhzgc/careless_whisper_flute_sheet_music_easy.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375200/normal_605c64d7b14ab.pdfIn PDF document text
    • https://cdn.sqhk.co/mezutorixo/j27ieZM/vovaborimonumotofijokezul.pdfIn PDF document text
    • https://cdn.sqhk.co/kinuneba/fdhcE24/word_blocksatz_lucken_zu_gro.pdfIn PDF document text
    • https://cdn.sqhk.co/zezetemirag/jfjjp8L/96301247725.pdfIn PDF document text
    • https://cdn.sqhk.co/gomiwopizi/FifVgfr/bigenesasofe.pdfIn PDF document text
    • http://sparzha.club/is_orange_chicken_from_panda_express_healthyztc6f.pdfIn PDF document text
    • https://cdn.sqhk.co/pozigafo/gehefhh/rumivimapaporurulovumox.pdfIn PDF document text
    • https://cdn.sqhk.co/rujiwujik/b36jdJg/78949970274.pdfIn PDF document text
    • http://kukushpa.fun/can_i_go_to_any_dps_office_to_renew_my_license4yq9a.pdfIn PDF document text
    • http://goldotzyv.ru/kundli_pro_64_bit_software_free10thm.pdfIn PDF document text
    • https://cdn.sqhk.co/dibirolinu/ghvihgd/roller_ball_lip_gloss_diy.pdfIn PDF document text
    • http://shoplus.info/kubota_bx2230_attachmentswsu1s.pdfIn PDF document text
    • http://golden-bridge.pro/how_to_use_a_s_curl_texturizergbd9w.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/ijjjhdI/michigan_head_basketball_coach_salary.pdfIn PDF document text
    • https://cdn.sqhk.co/vateviti/aQjc8At/action_bus_driver_jobs.pdfIn macro / runtime command snippet
    • https://cdn.sqhk.co/fepebage/bohchQg/betololinuselazojebokaz.pdfIn PDF document text
    • https://cdn.sqhk.co/xobetetivuzi/fPNgjjh/fakapajatariputodiw.pdfIn PDF document text
    • https://cdn.sqhk.co/wemowubire/ijjjIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2e2ccf0-b950-4e41-b218-44ebfb4b85f8/hp_laserjet_pro_400_m401n_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6b7a5b0-3838-479c-a827-01cb604d11cf/29108730454.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a013bd8-e9df-490d-9d1d-fbbf2bb851da/fume_ultra_greatsword_build_dark_souls_2.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1a7f6fd-fcd1-4a8a-aa23-c90931b28ada/kavozusoditevikizofizakud.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4A 5428 bytes
SHA-256: 5a800d91885cbef79eb9282f0177f963a97a6dd15bd46342314758b912de2ff1
font_01_sfnt_off00010096.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10096 10668 bytes
SHA-256: a20574dd57e254c0145bd7487ac26d4c64249efc09e402a0a13304a907713972
font_02_sfnt_off00012523.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12523 16068 bytes
SHA-256: 912e8c3c37b183d760f7f382ef110bdca05c7793b62d2efdd5772423ec248018