Malicious PDF — malware analysis report

Static analysis result for SHA-256 a433753859fdb5e0…

MALICIOUS

PDF

79.4 KB Created: 2021-03-19 12:40:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 9d40969753455cec444ae2a6759638a2 SHA-1: 21ff52fcf9bd4fcbfbcc7709d2a78a1995d87805 SHA-256: a433753859fdb5e091d69a332d794ede23a87410e528823583b8512b5e2cdf01
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9993

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://mezovuduw.ru/strik?utm_term=why+is+academic+text+important PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6015aad817c12.pdfIn PDF document text
    • http://kittyplay.online/767640811skmih.pdfIn PDF document text
    • http://xibawipo.22web.org/turnover_chain_song.pdfIn PDF document text
    • http://vekisonoloze.sportsontheweb.net/intex_18x52_ultra_frame_pool_parts.pdfIn PDF document text
    • http://faceit.su/how_to_calculate_pipe_cross_sectional_area8og0p.pdfIn PDF document text
    • http://obzorov.site/86893293435zlxa6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496585/normal_60054bf2afeec.pdfIn PDF document text
    • http://migipobazu.mypressonline.com/43932957204.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376609/normal_5fc916238b44e.pdfIn PDF document text
    • http://shoop-fl.ru/whirlpool_gold_quiet_partner_iv_filter_removal23417.pdfIn PDF document text
    • http://findssldz.xyz/rigivebsaqd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451574/normal_603ffa1187aa6.pdfIn PDF document text
    • http://pimebujeben.66ghz.com/kuludozisemewukojozujikeb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414152/normal_6042eaa43c431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421473/normal_5fd1ecf4ba685.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/72977263011.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb1cd387-549b-40f1-a5a4-67fd65d29bb3.filesusr.com/ugd/4200b4_27cecf5668244beaa5619b128a1dc45a.pdf?index=trueIn PDF document text
    • https://506dbbd1-d4b3-44b1-a4c9-6b5d0cab6a23.filesusr.com/ugd/c75f60_e911499378c443908988dbeb53eb1d25.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_46fef6bc4c1748d08ff213deb31d68d0.pdf?index=trueIn PDF document text
    • https://7fd9f749-07b0-48f8-ad51-68075edef824.filesusr.com/ugd/197648_5f89a03edacc4dca98f10a16714f3877.pdf?index=trueIn PDF document text
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_123be17668be4d99b7fc40e27d44c319.pdf?index=trueIn PDF document text
    • http://sanugifop.atwebpages.com/zapipurunozujotegul.pdfIn PDF document text
    • http://nosigegu.onlinewebshop.net/sivapuranam_lyrics_in_tamil_free_download.pdfIn PDF document text
    • http://miloxirabufa.epizy.com/describing_sunset_essay.pdfIn PDF document text
    • http://fupadawevedifi.rf.gd/calcul_de_la_clairance_de_la_cratinine.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_off0000f629.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF629 5464 bytes
SHA-256: 4792d11c4aae8ab6f1f588efad36394f3710de9c7656b5d95bfeb6dd924ba5c1
font_01_sfnt_off000108ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108AB 11140 bytes
SHA-256: 1a8a900d834dd0f6ecad7b49f20381285374ac257cce0d6986d080b5602c48c6

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