Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b49471aedc4a14…

MALICIOUS

PDF

80.2 KB Created: 2021-04-05 18:51:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 10928cfb9764b2e08954089a79cb5bad SHA-1: 1280b22492a5c7138ee66713b720c29d4fa38c7a SHA-256: c4b49471aedc4a14b14676b28e2d4eb929931f435eba0e8533bbb505978e9f87
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9996

Heuristics 5

  • 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.
  • 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://golowaki.ru/wix?keyword=basilica+of+st+lawrence+bulletin PDF link annotation
    • https://sumiloruxefeme.weebly.com/uploads/1/3/2/8/132814276/1310950.pdfIn PDF document text
    • https://xaviloxoganobe.weebly.com/uploads/1/3/1/3/131383750/paturifa-serowowojivo-kazojipirirota.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480897/normal_5fe13d7441c61.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469105/normal_60005cbe01d59.pdfIn PDF document text
    • https://zigikarorusoto.weebly.com/uploads/1/3/5/3/135351373/wokazelanazopovi.pdfIn PDF document text
    • https://jitolubupiloz.weebly.com/uploads/1/3/4/6/134637312/werili-ferutej.pdfIn PDF document text
    • https://jukudedavat.weebly.com/uploads/1/3/0/9/130969580/005a3bd.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kirezizinubov.rf.gd/wd_my_cloud_login_forgot_password.pdfIn PDF document text
    • https://s3.amazonaws.com/kibavutibeved/exenatide_metformin_biphasic_insulin_aspart.pdfIn PDF document text
    • https://5e54824a-8208-41b0-8aeb-7c017e8cfb46.filesusr.com/ugd/f64db8_e9849cf8d95f49e0a82e1ebc5ce687a1.pdf?index=trueIn PDF document text
    • https://c2267750-1f6d-4c2f-944a-eb302c7f07d7.filesusr.com/ugd/93971e_3427c61d6644475b8939be82a3f7d9a4.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tokafanawa/how_to_glue_sheet_metal_together.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/iso_31000_risk_management_process.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/69728124443.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/brigade_uniform_size_guide.pdfIn PDF document text
    • https://5dfb2dbd-6c80-4a99-afab-57dcddd938ef.filesusr.com/ugd/79d40d_2c61ebb5221e476a89bce759736a9460.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pewebopufupe/78955449752.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/bleu_de_chauffe_report_bag.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/96619266755.pdfIn PDF document text
    • http://bolunivagoxel.epizy.com/how_to_get_your_restricted_license_in_sc.pdfIn PDF document text
    • https://s3.amazonaws.com/lopadivupudexa/guidelines_for_writing_autobiography.pdfIn PDF document text
    • http://wobemiko.epizy.com/vobavojebadesolenedikorij.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_off0000f9ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9AC 5156 bytes
SHA-256: 72764633fb24611f4b75bc98b5891b7bbdf5aede6042343248096854aac1aa06
font_01_sfnt_off00010b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B5A 11828 bytes
SHA-256: a58d686a181c66999489ec4b6bdf93d7c2058135e8a91ffc269d411f405bf59a

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