Malicious PDF — malware analysis report

Static analysis result for SHA-256 9089cb4bfba74005…

MALICIOUS

PDF

88.8 KB Created: 2021-04-04 06:03:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e552d17d27bb86b864487e03319dbf68 SHA-1: e59e20c0dad63ec0aad62c7d95572f7efdbc25c7 SHA-256: 9089cb4bfba74005c54ef7b19ca0d3b630dc99c52cfe5e169e1d5c86822136b9
244 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 and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/123?utm_term=autocad+2014+trial+version In PDF document text
    • https://cdn.sqhk.co/sobetevod/bIjjjgc/giant_neostrack_website.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/IijpXmV/west_lawn_umc_facebook.pdfIn PDF document text
    • https://kuwomodelinero.weebly.com/uploads/1/3/0/7/130776449/nenimemolanatexivu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368978/normal_60531fcdaf7b0.pdfIn PDF document text
    • http://requiredjokblog.com/shark_lift_away_deluxe_manualwc49r.pdfIn PDF document text
    • https://cdn.sqhk.co/xubodijixali/hchcmre/solarxtreme_250_led_200_watts.pdfIn PDF document text
    • http://bufo.online/commendation_letterrg7j3.pdfIn PDF document text
    • https://rawogozanukej.weebly.com/uploads/1/3/4/6/134623914/gadonob-dikerifikoxew-tovowimikuso.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460946/normal_604ebcc27be00.pdfIn PDF document text
    • https://cdn.sqhk.co/fuxuduxexi/havghgf/silicon_valley_bank_login.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379363/normal_60028ab6d2c21.pdfIn PDF document text
    • http://lnstagramcentre.net/data_structures_in_c_c4ryco.pdfIn PDF document text
    • http://titanovyi-filtr.ru/describing_the_sun_on_your_skin9v064.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402722/normal_605b37bf4225b.pdfIn PDF document text
    • http://pro-konditer.com/international_law_jobs_chicagohtbg0.pdfIn PDF document text
    • http://xekumaluvox.iblogger.org/ravogogabile.pdfIn PDF document text
    • https://risenezapaf.weebly.com/uploads/1/3/4/4/134481661/4765394.pdfIn PDF document text
    • https://cdn.sqhk.co/xugikokazo/Ijbiddo/46494101412.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
    • http://netomaniw.rf.gd/27474163788.pdfIn PDF document text
    • http://xegebasitez.rf.gd/pofuraremelipubapokopuga.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/ruxilikagafofipop.pdfIn PDF document text
    • https://s3.amazonaws.com/juzewojavomofew/54816269591.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_off0000e9b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9B7 4032 bytes
SHA-256: 51036caeaaec89de8680405f123e86dc84267b6fe8b2de34ea0e6c667ded1fe3
font_01_sfnt_off0000f829.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF829 5280 bytes
SHA-256: 7946be955f455436b183c76f231f4df9c46d918dcafca7280505cfa57f4ec4bf
font_02_sfnt_off00010a2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A2B 12068 bytes
SHA-256: 91df0eac45dc088a07a1f2ab91430f17c4b85c224b623fc2b75c098d8ec90a6b
font_03_sfnt_off000131d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131D0 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_04_sfnt_off00014700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14700 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c