Malicious PDF — malware analysis report

Static analysis result for SHA-256 900ccbc613a25b31…

MALICIOUS

PDF

94.3 KB Created: 2021-04-05 09:27:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c00a1ae45e29df124825adfb947eabc5 SHA-1: 6fd4e42d69d04130a583270404e0efa91d57120b SHA-256: 900ccbc613a25b31910115ab1bcfd9b608d50fdac1033dc399cba8e2a5270128
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to suspicious domains, indicating a phishing or malware distribution attempt. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a deliberate effort to obscure the true malicious intent by using link farms on disposable hosting. ClamAV detection and ML classification further confirm its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://fokemale.ru/award?keyword=esl+punctuation+exercises+pdf PDF link annotation
    • https://cdn.sqhk.co/nuzozuni/5jijdia/download_major_mayhem_2_cheat_mod_apk_home.pdfIn PDF document text
    • http://hq-cleartv.info/another_eden_uquaji_guideblqhq.pdfIn PDF document text
    • http://fortuneo.biz/8784727501msnlp.pdfIn PDF document text
    • http://jegajini.iblogger.org/it_sewer_scene_book.pdfIn PDF document text
    • http://azakalaza3.xyz/1441316940rgjmb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_6041b7a1e302f.pdfIn PDF document text
    • http://natbeach.space/gazupemavenobrd6zr.pdfIn PDF document text
    • http://watulexop.iblogger.org/lexus_es300_headlight_ballast.pdfIn PDF document text
    • http://laitlabs.pro/53147137438a72vw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475572/normal_5fd0f0bd7a620.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454575/normal_6031ed85dd6da.pdfIn PDF document text
    • https://cdn.sqhk.co/mekurapiw/MNHgcgd/27873375756.pdfIn PDF document text
    • http://jefaritixe.22web.org/pigolewotegodexuduvapif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejokazemur/nanofikaz.pdfIn PDF document text
    • https://s3.amazonaws.com/timeziso/jesus_calling_daily_reading_for_today.pdfIn PDF document text
    • https://3568c1c9-c281-4b9a-9ea9-d5d291e0176b.filesusr.com/ugd/e5d8db_d4905ad1c7c241e484ae2916d5c66779.pdf?index=trueIn PDF document text
    • https://f110cc6a-49d6-427c-9ab6-a3a4d323b004.filesusr.com/ugd/9e53d4_648eba1d17224e1c90a9da9349d5c96b.pdf?index=trueIn PDF document text
    • http://romipozaxijida.rf.gd/dr_wayne_w_dyer_net_worth.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/16916412227.pdfIn PDF document text
    • http://puredaw.rf.gd/tarapuwipusil.pdfIn PDF document text
    • https://s3.amazonaws.com/pesetufavo/honda_em5000s_generator_for_sale.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_off0001162d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1162D 5172 bytes
SHA-256: 88be3dbc50a65114ca8aea5728553a02835f827522c7d39bddee5be5cf6f1994
font_01_sfnt_off000127e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E1 11648 bytes
SHA-256: a412e373207a588096d584856538accb65b5575bd70651245c147a7cecfdf469
font_02_sfnt_off00015002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15002 17492 bytes
SHA-256: 81c494f351c450bd7db82348667d1955c4501b70869adefd221b6c1cf4e32ab6

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