Malicious PDF — malware analysis report

Static analysis result for SHA-256 033eaa3fd83b2a86…

MALICIOUS

PDF

76.3 KB Created: 2021-03-03 16:19:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5603692ca0e5ab4a3898f1db30fedcaa SHA-1: 4c470c449cc83e9a847c834d9d518f243ffe2ddb SHA-256: 033eaa3fd83b2a86d67daba7970d52c14d3b6f9096a9a545c8e2900aa1b53c9b
186 Risk Score

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 0.9998

Heuristics 6

  • 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.
  • 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://druttle.ru/award?keyword=data+structures+in+c+free+pdf+download PDF link annotation
    • http://foxiduwanati.mygamesonline.org/vobitusabaxizaxizeseno.pdfIn PDF document text
    • https://fogufufizanalu.weebly.com/uploads/1/3/0/8/130813948/xuzefulusawetag.pdfIn PDF document text
    • https://cdn.sqhk.co/bibolaned/jhDgija/nojovogitivamefo.pdfIn PDF document text
    • http://sufulilutidake.mypressonline.com/nebovak.pdfIn PDF document text
    • https://cdn.sqhk.co/mogujawogo/hhLgcjg/17109719160.pdfIn PDF document text
    • https://cdn.sqhk.co/wefenosefob/Zcd0gtX/nascar_heat_mobile_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/7chfhg1/boo_2020_svg.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/897227583013bak.pdfIn PDF document text
    • https://nogapixefakul.weebly.com/uploads/1/3/4/5/134590999/9d4d0fc608.pdfIn PDF document text
    • https://cdn.sqhk.co/xajamenujo/Eidgg1h/63379296542.pdfIn PDF document text
    • https://buporinedo.weebly.com/uploads/1/3/4/0/134041533/besekinevowajewuke.pdfIn PDF document text
    • https://cdn.sqhk.co/jimavidozeze/yWRjcgj/40630944088.pdfIn PDF document text
    • https://jimukara.weebly.com/uploads/1/3/4/2/134235432/movebodaf.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/1996_mercury_225_efi_weight.pdfIn PDF document text
    • https://cdn.sqhk.co/suxujaba/jeTbhjb/86265096618.pdfIn PDF document text
    • https://segamivudafipem.weebly.com/uploads/1/3/2/7/132740242/1574191.pdfIn PDF document text
    • http://magazinrf.xyz/topographical_survey_reportmv1b9.pdfIn PDF document text
    • https://togoxijagujeg.weebly.com/uploads/1/3/0/7/130775712/duluwopaguvifirunof.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000df49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF49 5240 bytes
SHA-256: cf05ab1ca0f106000cf10164c4e5cf264d847852fcc59f3f8657e562346eb879
font_01_sfnt_off0000f140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF140 1800 bytes
SHA-256: e9a5a1f6ed95b1e3669933bb00002ad32a1708c3e0b735191cad5e02368a6c7d
font_02_sfnt_off0000f9ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CE 15852 bytes
SHA-256: 79d15d7b101e3c781e7bd3ec448fcc18da94dc150c42c18127375fc0a46caa3b

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