Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e138c58b724df19…

MALICIOUS

PDF

81.2 KB Created: 2021-04-01 02:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 78112a73d16a8c147f322af5d1d79c05 SHA-1: 9f352299a3383af4ca5a8e40cdab1dff82ed7a94 SHA-256: 9e138c58b724df19aa8b6b7ec832ea58214a5e263b679de795ab4df8437bef84
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are dynamically generated and point to potentially malicious content, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs and the structure of the PDF point towards an attempt to redirect users to malicious sites, possibly disguised as search results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/wix?keyword=mathcounts+problems+and+solutions+pdf PDF link annotation
    • https://cdn.sqhk.co/gesokusa/BSgf7bg/paw_runner_puppy_pads.pdfIn PDF document text
    • https://cdn.sqhk.co/nupasoxure/jgWjeha/xutitodatufoboba.pdfIn PDF document text
    • https://cdn.sqhk.co/bakimexatura/hd0ihhd/97812519168.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470523/normal_603957b518676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403264/normal_6057f6b642e80.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/jfgcbia/mr_flat_pack_furniture_shop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408992/normal_60122c823748b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454971/normal_5feafb543b936.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_5fca27ca96e68.pdfIn PDF document text
    • https://cdn.sqhk.co/gasajolop/jhhgGmP/kamogelu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492575/normal_5ffd3728202d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379849/normal_5ffbe9b627325.pdfIn PDF document text
    • https://pejifivoriruruk.weebly.com/uploads/1/3/4/3/134314693/3542962.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481993/normal_605ba6910ae9d.pdfIn PDF document text
    • https://newabezuvusadak.weebly.com/uploads/1/3/5/3/135347141/libotelopizupab-moxubifomazuwo.pdfIn PDF document text
    • https://rasafidi.weebly.com/uploads/1/3/0/7/130776861/mozofanup.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/zolerazowubow/kundalini_yoga_teacher_training_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/atlantis_is_calling_song.pdfIn PDF document text
    • https://s3.amazonaws.com/genedonapubefe/apple_beta_profile_ios_13.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/list_comprehension_python_filter_duplicates.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/poxoxaxititoruguwewavofe.pdfIn PDF document text
    • https://s3.amazonaws.com/dosalapasenow/nasadedawapanudum.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/vehicle_body_damage_report_template.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C5 5424 bytes
SHA-256: 3a79fce2d096e0b3d1a734f9740522e472fd8b48e2ed324cb09ae005b3ce9559
font_01_sfnt_off000104fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FB 10480 bytes
SHA-256: 3d77155948f5cf1a37bc8258ea685a0be5dbdbbf33f2b9e6da88a9a1674241af
font_02_sfnt_off000128d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x128D8 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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