Malicious PDF — malware analysis report

Static analysis result for SHA-256 97c4410e7d649929…

MALICIOUS

PDF

76.4 KB Created: 2021-05-11 08:44:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: d99e25b274ba33e5722e8a81c538a9e8 SHA-1: edb27877c19d68c481478a12773c7eb368fc3314 SHA-256: 97c4410e7d64992992df264a548ab6b5240b679eb3b5a589e96d3d25945f3526
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/strik?utm_term=sims+3+expansion+packs+free+steam PDF link annotation
    • http://shoop-fm.ru/71031478038y67ty.pdfIn PDF document text
    • https://cdn.sqhk.co/mikedeto/jg97wcU/failarmy_channel_on_youtube.pdfIn PDF document text
    • http://zibepifutidi.sportsontheweb.net/attachment_theory_ainsworth.pdfIn PDF document text
    • http://kutatit.getenjoyment.net/206808410.pdfIn PDF document text
    • https://cdn.sqhk.co/bataseset/gibhaVe/ruxetigibenugaxiledunub.pdfIn PDF document text
    • https://cdn.sqhk.co/vasozaponem/cgghhgi/dragon_model_kits_canada.pdfIn PDF document text
    • http://resimpub.com/free_comprehension_worksheets_ks3_uk1b88b.pdfIn PDF document text
    • http://everydays.space/lisefixatajuwizawumt276z.pdfIn PDF document text
    • http://hookup681.site/bixafemokuwomusixorevajce61.pdfIn PDF document text
    • http://qwert-ita.fun/internal_quality_audit_procedurevb61l.pdfIn PDF document text
    • https://cdn.sqhk.co/kitaparek/ia9rihG/my_chu_virtual_pet_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/pumibavi/xif2gcB/68488898595.pdfIn PDF document text
    • http://lutefadeba.scienceontheweb.net/zumovezojopifit.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nunavaxukozu.onlinewebshop.net/53306280171.pdfIn PDF document text
    • http://pomagupivedib.epizy.com/90187598151.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/80333759573.pdfIn PDF document text
    • http://gisenusob.rf.gd/what_is_world_literature_essay_brainly.pdfIn PDF document text
    • http://mimewimirul.rf.gd/88647530129.pdfIn PDF document text
    • http://pirokogux.epizy.com/examples_of_assets_and_liabilities.pdfIn PDF document text
    • http://kavuduvolilazod.myartsonline.com/thinking_skills_worksheets_for_grade_1.pdfIn PDF document text
    • http://doxewadafexe.rf.gd/liquid_nitrogen_msds_sheet.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_off0000e63d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE63D 5528 bytes
SHA-256: d6b5e4b5d7b387a54fdd91378fa1f1ee3c376af2a0f6f208f532e07cf2efd541
font_01_sfnt_off0000f8fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8FD 13580 bytes
SHA-256: d8e0bc1bba6be5937b9d6a482a198933caaf1715d946759415132044dec740cb