Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8ea006c69b83709…

MALICIOUS

PDF

92.5 KB Created: 2021-05-17 17:02:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 15db13013f0d0d28b6a3db6f92ebc906 SHA-1: 2d242504ea5b3acf416c721513327fea8b67fd95 SHA-256: f8ea006c69b837094f88a7874cc78abd5dc7f49e4a5fa547906d6d827f885c87
166 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, and another that appears to be a redirection to a malicious domain. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the presence of commands that could be used to download and execute further payloads, likely leveraging JavaScript within the PDF.

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
  • 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://soxebez.ru/strik?utm_term=how+to+fix+maytag+gas+dryer+not+heating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467286/normal_5fe8792262437.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473419/normal_5fed9fcaae482.pdfIn PDF document text
    • http://nunopasatipimav.medianewsonline.com/bayanat_jameel_book.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_602346852688b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475727/normal_5fd3ddb9bcf65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388062/normal_5fc7a3f030ff9.pdfIn PDF document text
    • https://cdn.sqhk.co/jigavozef/gihcphj/kodent_dental_lab.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416806/normal_6018b7ee832e3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482023/normal_6034979468c34.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/case_study_method_of_teaching.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369496/normal_604d11ffd6d50.pdfIn PDF document text
    • http://wopebexe.66ghz.com/bureaucracy_theory_by_max_weber.pdfIn PDF document text
    • https://cdn.sqhk.co/suwajipox/5jcgdJA/reversible_sectional_sofa_ikea.pdfIn PDF document text
    • http://jidevutijosu.iblogger.org/define_teaching_methods.pdfIn PDF document text
    • https://cdn.sqhk.co/nusideja/fgddbic/grass_cutting_machine_price_in_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/wabajevebe/iirmgdF/easter_egg_candy_slicer_games.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385853/normal_606e63e99bc9e.pdfIn PDF document text
    • http://maxirem.mygamesonline.org/how_the_grinch_stole_christmas_words_to_songs.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.coIn macro / runtime command snippet
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mipeboro/how_to_use_a_prophet_sport_lipo_charger.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/how_to_use_long_aid_curl_activator_gel.pdfIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/80177164537.pdfIn macro / runtime command snippet
    • https://s3.amazonaws.com/defipedibe/94444302335.pdfIn macro / runtime command snippet
    • http://vulopekusape.atwebpages.com/kofanexudabolu.pdfIn PDF document text
    • http://defakulid.atwebpages.com/buvewavoradosuz.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_off000128ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128EA 5512 bytes
SHA-256: 51dabc0c08b2d05773291398710b6813d485839ecaca42dce7871937f9a8ee81
font_01_sfnt_off00013b9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9B 12484 bytes
SHA-256: e9ce8eff62827b0b4619367fbf252fa78ea1dbd558eb17eb7c287f31f2483685