Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac2d8f5e67676c6…

MALICIOUS

PDF

83.3 KB Created: 2021-03-06 10:49:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: b6e085a56643489e40dd3e4d0891e181 SHA-1: c3d064216782c02d3cad8d25d792ef6e4d604edb SHA-256: 4ac2d8f5e67676c645dc0c3bd7f4a01dc797585e7ed553ba149aeaa73df62738
186 Risk Score

Malware Insights

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

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 0.9992

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
  • 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.
  • 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://gimoguvi.ru/123?utm_term=motorola+h730+bluetooth+headset+best+buy PDF link annotation
    • https://resuzomesidi.weebly.com/uploads/1/3/4/7/134746605/garefigebonevo.pdfIn PDF document text
    • http://spoonnumberone.xyz/google_voice_assistant_apkpurey26lc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411708/normal_5fe887e52e693.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451356/normal_60336e786dab8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453560/normal_6022b0132c1b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370288/normal_5fe6f6e79aa77.pdfIn PDF document text
    • https://zimizediregewoj.weebly.com/uploads/1/3/4/0/134040679/penetavigazofit_gisog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503578/normal_6018871d07bac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382778/normal_5fe8c125bdb3b.pdfIn PDF document text
    • https://maxafusisiwesu.weebly.com/uploads/1/3/4/6/134688878/3887486.pdfIn PDF document text
    • http://converstarget.ru/systemverilog_for_verification_a_guide_to_learning_the_testbench_language_features_3rdjne45.pdfIn PDF document text
    • http://goossyy.online/comptia_a_practice_test_answerso51qu.pdfIn PDF document text
    • http://lolkek.xyz/85841574406yjyrb.pdfIn PDF document text
    • http://vinnipoh.fun/nunevupogapila47acz.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/97ab3b229a2ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479240/normal_602147b367a10.pdfIn PDF document text
    • https://gixisisopovi.weebly.com/uploads/1/3/4/7/134713576/e5087566a8da1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427523/normal_603f31c80f981.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/tuxexi/goxegolaromikej.pdfIn PDF document text
    • https://f1ddcea9-c323-452c-a4d3-aaefec61e50a.filesusr.com/ugd/defd8a_debeca79de404c309b8cb3238f0a9a13.pdf?index=trueIn PDF document text
    • https://068ba8bc-08b0-4b68-8151-f3c59c7a5775.filesusr.com/ugd/5a4aad_687829e885d64810af7eb970b35445b7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/peveziwoguxuzam/63782306597.pdfIn PDF document text
    • https://s3.amazonaws.com/dutimajizowa/huckleberry_finn_movie_1939_cast.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_off000107c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C5 5544 bytes
SHA-256: 9074158671d1cc0e4fa7975e289706f7967b62ea9ce7355d435f297f4c85f16d
font_01_sfnt_off00011aa0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA0 10680 bytes
SHA-256: 21efd426b952724c980bc68b6e3def31020236ec2579588939e5289cd22ef25e