Malicious PDF — malware analysis report

Static analysis result for SHA-256 924a244d692c5593…

MALICIOUS

PDF

75.5 KB Created: 2021-03-06 03:11:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 72e1693399d630b0c4d6df97d13262c9 SHA-1: b74eed66facfd38ba42bc410d1e0235a74110b08 SHA-256: 924a244d692c5593a2f7640b9877ca26d811e10264d6511aa22122de4712ab61
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and ML classifiers indicated a high probability of maliciousness. It contains a large number of external links, suggesting a link farm or phishing attempt. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards malicious intent, likely to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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/123?utm_term=tactical+rifle+classes+near+me
    • https://dupopawo.weebly.com/uploads/1/3/4/6/134652833/xopifakuvu.pdf
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc61e696b5be.pdf
    • https://static.s123-cdn-static.com/uploads/4461229/normal_5fcd294c3338f.pdf
    • http://natiral.space/family_bible_study_guide_online_free6tjqk.pdf
    • https://rijevolokawuja.weebly.com/uploads/1/3/4/6/134661742/9576401.pdf
    • https://junipupupu.weebly.com/uploads/1/3/4/7/134739756/lixuto-jiduw.pdf
    • http://meetsucre.pro/mizekugavafuwerorpj9cr.pdf
    • https://cdn.sqhk.co/nisisepolo/Shhnf8d/new_bright_rc_buggy_vortex.pdf
    • https://nunosutelakib.weebly.com/uploads/1/3/1/3/131383720/a8ffbdde67484f.pdf
    • https://dawopurasujup.weebly.com/uploads/1/3/0/7/130775219/1016624.pdf
    • https://static.s123-cdn-static.com/uploads/4403127/normal_600484e5ea693.pdf
    • http://setofexperience.site/cursive_handwriting_sheets_ks1_freeqcgw2.pdf
    • https://merugerizun.weebly.com/uploads/1/3/4/3/134337850/8178929.pdf
    • http://malespw.xyz/samsung_ipolis_default_password3s8v4.pdf
    • http://takilajonireko.22web.org/jurnal_hernia_inguinalis.pdf
    • https://takogazaka.weebly.com/uploads/1/3/4/0/134017011/6521429.pdf
    • https://cdn-cms.f-static.net/uploads/4408001/normal_60177488703bc.pdf
    • https://cdn.sqhk.co/rujiwujik/w34ijih/download_spin_tops_unlimited_money.pdf
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/4011321.pdf
    • https://zikazofikadit.weebly.com/uploads/1/3/0/7/130739129/nafujugenib-nobulatasozub.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://satonavuka.rf.gd/finding_slope_practice_answer_key.pdf
    • http://nezazokufuj.rf.gd/skyworth_smart_tv_remote_control_for_sale.pdf
    • http://vegunag.rf.gd/zuxugedakabojasanazubox.pdf
    • http://pevinojemodil.rf.gd/what_would_cause_a_sewing_machine_to_skip_stitches.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eadf.bin
2de7f301cb6605965bd78da5bb1bbfd3c734bc87066c0500d8db7623cf10f1e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEADF 4976 bytes
font_01_sfnt_off0000fbb1.bin
102f808c594cf636bb62d7f5586d9838f7b130c345161d156fa3c71f001dd6a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB1 10836 bytes

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