Malicious PDF — malware analysis report

Static analysis result for SHA-256 6395d4cec5730205…

MALICIOUS

PDF

83.1 KB Created: 2021-03-10 00:24:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ac11710eac0e948b116700873df8d331 SHA-1: 9c082e855fab949cd5f86392617079b56c542acc SHA-256: 6395d4cec5730205e53a863a694625ee4e606019be5414d52ef335ccca2c9f71
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 0.9997

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://resalured.ru/award?keyword=brownian+motion+calculus+ubbo+f.+wiersema+pdf PDF link annotation
    • https://fapixuguxoga.weebly.com/uploads/1/3/1/0/131070829/806d9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379732/normal_5fd60d017456d.pdfIn PDF document text
    • https://wanevowak.weebly.com/uploads/1/3/4/4/134465130/wowekozafal.pdfIn PDF document text
    • https://gidixolatuloxag.weebly.com/uploads/1/3/1/0/131071157/56d5663.pdfIn PDF document text
    • http://douchehub.xyz/audi_r8_v10_plus_performance_upgradesbfgas.pdfIn PDF document text
    • https://zofawuzi.weebly.com/uploads/1/3/5/3/135323082/difarutaxafexoj.pdfIn PDF document text
    • https://sekugiwa.weebly.com/uploads/1/3/0/7/130739582/7574961.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375515/normal_600b75a492648.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409255/normal_5fe6a56fe3354.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450148/normal_601729cfc0853.pdfIn PDF document text
    • http://universe1.space/4870826411978t05.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411696/normal_60027fac14324.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/gedexim/campton_book_font.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/bostitch_brad_nailer_user_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/eso_leatherworking_leveling_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gezizefefififa/mht_cet_law_application_form_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/daselex/weed_grow_bible.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/dodizaletazivofekop.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/kinufokanevopoparalow.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/13563975615.pdfIn PDF document text
    • https://s3.amazonaws.com/gezetega/17904826088.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/64341813341.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_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 5616 bytes
SHA-256: 613a628462b2e86aa2e28969e576a155647ccd59bdb54d49cdbaefa221d8e694
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 16884 bytes
SHA-256: 7379af8a78ba9ba247d3e7622d059b87fad39cb4d4a0a95e64ba1ddbdd37129c

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