Malicious PDF — malware analysis report

Static analysis result for SHA-256 59e3e85e81954612…

MALICIOUS

PDF

94.0 KB Created: 2021-05-24 03:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 440fa0d0e65f21cc8634890e9373e25d SHA-1: 9ab3796cca654a1ad50b91baef6349f61402e33a SHA-256: 59e3e85e819546124fc4d46ac4ba3e7579c75bfe955024c4cc28e39440275491
96 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 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 4

  • 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://xajibur.ru/strik?utm_term=adda+247+monthly+current+affairs+pdf+in+hindi PDF link annotation
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/zigemunazexi_vakimoto_dopabesoko.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453754/normal_60038fcd83cff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416653/normal_5fca4678a9fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471273/normal_5fe91f97243f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4463560/normal_6015ff67c2b64.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/redujodi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403410/normal_60658cc913bff.pdfIn PDF document text
    • https://tizijepen.weebly.com/uploads/1/3/4/2/134234944/nozamilekixemutexu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376380/normal_6047359b63a3b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481166/normal_6008e54e57219.pdfIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/dowavelaxam/how_do_i_love_thee_poem_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/mubemutolewe/zovuxudub.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/jikikadufesumo.pdfIn PDF document text
    • https://s3.amazonaws.com/tobovunoberiki/95457846533.pdfIn PDF document text
    • https://s3.amazonaws.com/wuzalugiseto/97657995177.pdfIn PDF document text
    • https://s3.amazonaws.com/xapidajovaji/dadovupaverajebizulebulex.pdfIn PDF document text
    • https://s3.amazonaws.com/jafujasiwetid/treadclimber_tc10_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/10618261783.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
stream_004_off00013700.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13700 17036 bytes
SHA-256: 6cb3dc3a583a24d5cb0651525c67ddf6ec51cc0c0e5c1b7a52c7ff88e23d6e5e
font_00_sfnt_off0000fd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD78 5788 bytes
SHA-256: 0373eb59ecf9a75604626b5d7fecad27151833248602fe77f0b244465e8cbe38
font_01_sfnt_off0001111b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111B 11040 bytes
SHA-256: a2026ccaf19c45050c59d5bf090c75e102e35db355827532ae093b1e237f7bd5

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