Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10465b78e810b75…

MALICIOUS

PDF

105.7 KB Created: 2020-12-03 15:09:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 04994a7108d8daee4854da5be910be66 SHA-1: df68246eb538f62f32891bbdd98b3d3c41c7dad9 SHA-256: c10465b78e810b75b699ed863149bd0cd4390c330c24eab1551526988e6dfea5
186 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 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://traffset.ru/123?utm_term=significance+of+van+der+waals+constant+a+and+b PDF link annotation
    • https://warimeso.weebly.com/uploads/1/3/4/7/134720830/jitedepov_lujof_vimudeju_tidatap.pdfIn PDF document text
    • https://rolewexuvuviwu.weebly.com/uploads/1/3/4/7/134742390/817464.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/36ce75ac.pdfIn PDF document text
    • https://nofituzajevi.weebly.com/uploads/1/3/4/6/134638777/zebomupa-temubexefadi-rodewosoko.pdfIn PDF document text
    • https://ximewenidurap.weebly.com/uploads/1/3/4/6/134651426/wokotokajixajo_zepapida_bowisenojufu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416932/normal_5fbdda23829ab.pdfIn PDF document text
    • https://siwizapetodid.weebly.com/uploads/1/3/4/0/134041585/resiji-pebatifibanija-mopetebibome-fizomanesifago.pdfIn PDF document text
    • https://napuximijagebi.weebly.com/uploads/1/3/4/7/134766840/f8ae5b83.pdfIn PDF document text
    • https://tifobavojosimiz.weebly.com/uploads/1/3/4/5/134505066/3054084.pdfIn PDF document text
    • https://tetemubegogik.weebly.com/uploads/1/3/4/4/134443084/suxagovasuwumoleraf.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/jofunozuzof/grundfos_booster_pump_installation_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/vexosafugunu/allah_s_names.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2e7c468612547ed6b246b/t/5fc7739748d5672cfb3ff10d/1606906778447/80240897413.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc0cdab3398ff75152d912c/t/5fc86f0ddcb5b260797bfe12/1606971150418/super_city_building_game_pc_download.pdfIn PDF document text
    • https://s3.amazonaws.com/leguvefu/autocad_14_tutorial.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000141c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C7 5584 bytes
SHA-256: 3403fb05b3e9fd371a5885627771e3807b462735590fdd2106e9730713537540
font_01_sfnt_off000154f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154F8 13580 bytes
SHA-256: 3160c9d6fae55e3ea358da474c1abee787e3092155d57b47e227ea0002149d7d
font_02_sfnt_off000183ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x183AE 16200 bytes
SHA-256: 794632cb4d8392d6c47a8eb614bc8efadbb4d37d3f0fb353eb9a35a3e42ace08

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