Malicious PDF — malware analysis report

Static analysis result for SHA-256 be374ac64424830f…

MALICIOUS

PDF

82.9 KB Created: 2021-05-23 22:25:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 7ba5cd2cb6ebeeac7b53de00b9c4d9ea SHA-1: 31b94788673b43b503c591700e5c4ea4322f3558 SHA-256: be374ac64424830f003fe78d4d27cbe6065d5a580902e93c744a7258865d34c4
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF_SEO_LINK_FARM' indicating a large number of outbound links. The primary URL points to a domain that appears to be part of a link farm designed to attract users searching for specific content, likely to redirect them to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, consistent with phishing or malware distribution.

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 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.
  • 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://pelibifir.ru/strik?utm_term=sword+art+online+progressive+volume+4+light+novel+pdf PDF link annotation
    • https://wosumugip.weebly.com/uploads/1/3/4/8/134867897/limoko_peroravebonip.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481695/normal_5fca49fe1951c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451567/normal_606a54b948ae7.pdfIn PDF document text
    • https://xegazoniwenopuk.weebly.com/uploads/1/3/6/0/136011370/farukopokego.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489981/normal_6018dd59dd36b.pdfIn PDF document text
    • https://vumopofusub.weebly.com/uploads/1/3/0/8/130874587/38a41931b.pdfIn PDF document text
    • https://digulowewuw.weebly.com/uploads/1/3/4/3/134363346/e28d16264efa16b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375361/normal_6019d4c27b1c2.pdfIn PDF document text
    • https://fubareno.weebly.com/uploads/1/3/1/4/131482864/mofemorevagedi_zetetobavisaw_vobevixe_vesuvuvemuvixup.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/65b96093-b67c-4d6a-9207-315ea5e39765/vopuxifibasosimarodad.pdfIn PDF document text
    • https://s3.amazonaws.com/lunojol/training_tracking_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/mansions_of_madness_2nd_edition_monsters.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/general_knowledge_questions_and_answers_in_nepali.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/77758215202.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79cbfeb2-4cae-4b02-9db9-7f57e5265240/xbox_one_skyrim_mod_load_order.pdfIn PDF document text
    • https://s3.amazonaws.com/setigafat/commodore_64_emulator_download_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/xojafemori/aptoide_apk_8._0._2._0.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/ziwasifebabutizitakevirop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341db955-1520-459c-8194-87b1a562b11f/mopaju.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e38ec075-b46f-4e5c-80df-defca0f8313b/what_to_eat_while_on_herbalife_21_day_cleanse.pdfIn PDF document text
    • https://s3.amazonaws.com/golepe/sosoriraburifogoguwor.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_off0001041a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041A 5796 bytes
SHA-256: a178070e1e17825327420029efd43bd036a133026845f2623e6dcd62dbc9e142
font_01_sfnt_off000117cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117CD 11116 bytes
SHA-256: be8eed81e3baf6606d8c6767c23a6fa73541172ea8c8ac5c3643ad867c400437

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