Malicious PDF — malware analysis report

Static analysis result for SHA-256 230be6ff76e891f5…

MALICIOUS

PDF

91.7 KB Created: 2021-05-22 19:43:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5627b85b35927913bd2f8179bbfcbc74 SHA-1: dad9ece285281510dcb5f9add075ae807380951b SHA-256: 230be6ff76e891f5f1ea3d7105260142dbb008a4a9fae37dee62f0519064ed01
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 0.9992

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/strik?utm_term=propiedades+fisicas+y+quimicas+de+los+alquinos+pdf PDF link annotation
    • https://bovusobovazova.weebly.com/uploads/1/3/4/5/134596491/6899575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418399/normal_605a2d1377916.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_6052dc0c4ce09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450154/normal_5fdc1bf2ce10a.pdfIn PDF document text
    • https://xofofafe.weebly.com/uploads/1/3/1/4/131438501/zajakajiwimo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419650/normal_5fdae4c2ba83e.pdfIn PDF document text
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/sezipajazi.pdfIn PDF document text
    • https://gagavupotiwek.weebly.com/uploads/1/3/0/8/130813998/pimoxumupadi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365606/normal_60459f1a7dec6.pdfIn PDF document text
    • https://bubinaxe.weebly.com/uploads/1/3/2/6/132681619/bb0397f79af.pdfIn PDF document text
    • https://napajudiweji.weebly.com/uploads/1/3/4/3/134316113/7184318.pdfIn PDF document text
    • https://zigaxedalinuj.weebly.com/uploads/1/3/4/0/134016671/7132882.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/pewebopufupe/flying_beautiful_birds_images.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/20563326829.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75246423-5a2e-4785-b8a8-f1bc2e49b5f1/a_vesicle_inside_the_cell_fuses_with_the_plasma_membrane_and_releases_its_contents_outside_the_cell.pdfIn PDF document text
    • https://s3.amazonaws.com/nigimul/kotlin_mvvm_android_github.pdfIn PDF document text
    • https://s3.amazonaws.com/xunilukegez/gilaguwajoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a95ed2c2-ec65-4a43-a2de-060bfe346760/grade_4_geometry_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/nejedunegetirotagoru.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f979.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF979 5332 bytes
SHA-256: afb9b543f664130e63bf0ed80135547287cf34eefd8a8f96d998d622acb9b075
font_01_sfnt_off00010b71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B71 1796 bytes
SHA-256: d9f96797a54aa890ffc864a62d0ee1bea369dc139b9f5922dbee51669d5f236a
font_02_sfnt_off000113fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113FD 12076 bytes
SHA-256: f61feeef30a903557cabdeac4d848442ee8204f18c3bb914bc8e739dea2f46ff
font_03_sfnt_off00013b9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B9C 16036 bytes
SHA-256: 35d3440dae1ebc896564e4e6f70ea95aa3a30a1ac603c7fffbb21b68b8b72e2f
font_04_sfnt_off00015006.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15006 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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