Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc7130f636418793…

MALICIOUS

PDF

84.5 KB Created: 2021-03-27 16:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 4d63717458388006c263d293f343eb59 SHA-1: dab417c0daac42247b0a99a5d64b24a24278a2a3 SHA-256: dc7130f6364187930c0ed6a3535318c19e64f2deca033add685b5e37a2dc9a9d
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 0.9998

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://leonvi.ru/123?utm_term=plan+cadastral+informatis%25C3%25A9 PDF link annotation
    • http://freud.icu/briggs_and_stratton_intek_engine_surgingugwuu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457318/normal_6048e384d18ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369774/normal_5ff0467e6c264.pdfIn PDF document text
    • http://apkweb.net/python_list_insert_at_front_complexityknzjo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_601e901f1764e.pdfIn PDF document text
    • http://povar2020.site/how_to_use_staedtler_calligraphy_markers7827a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_600a129261086.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386073/normal_60492bc380072.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404520/normal_603ded5dabc07.pdfIn PDF document text
    • http://lolkek.xyz/783484223425fv9o.pdfIn PDF document text
    • http://presentinsta.online/gilopatigorigenabijul2jon.pdfIn PDF document text
    • http://tikovg.xyz/226853371317h6tc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418778/normal_5fdd66e3e3446.pdfIn PDF document text
    • http://instacopyrighthelpteam.com/84590676312e916b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446925/normal_6035b06de6099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413126/normal_603b39caeecfb.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
    • https://s3.amazonaws.com/bitajemisajoz/bing._com_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/wizitifowubux/xevapezivebinujimeb.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
font_00_sfnt_off0000fe46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE46 4980 bytes
SHA-256: d70b276cb474a0cb1cb62633d86937f1242256a100c2ee318dda931a06bdaffb
font_01_sfnt_off00010f0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F0D 12028 bytes
SHA-256: 6fe8917e56c58b4dfccea4332dc85b22a24554434fe204b7f759b9366ce11b47
font_02_sfnt_off000134f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134F5 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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