Malicious PDF — malware analysis report

Static analysis result for SHA-256 d09d57509ed3546f…

MALICIOUS

PDF

71.1 KB Created: 2021-06-10 12:18:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b94ba276a25c3f9e78d5eea23214c470 SHA-1: 1d40cd67cb1f80dd78272e7952b1c86982f780c9 SHA-256: d09d57509ed3546f319258cc1ea25ffce60d5b5cee000aad8f4f67c2ad21da56
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 0.9992

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://chcial.ru/pbw?utm_term=moped+vin+lookup PDF link annotation
    • https://dukozajaxal.weebly.com/uploads/1/3/4/0/134017298/3740942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390660/normal_604b00dbb551c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380859/normal_6066da5281acb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378425/normal_5fda154e0502f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484359/normal_6049af319eb12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367302/normal_604b395ed7ba6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fd672ec5ec28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371523/normal_600e639ca26a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495058/normal_60c12b4197719.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369494/normal_5fc576cdd1166.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375350/normal_60336553445c9.pdfIn PDF document text
    • https://bawobejeburojax.weebly.com/uploads/1/3/1/1/131163695/vajopogigo-vokababazimot-poderot.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kunixove.pbworks.com/f/axolotl_julio_cortazar.pdfIn PDF document text
    • http://kegogaxevu.pbworks.com/w/file/fetch/144898821/ww2k17_apk_obb_download.pdfIn PDF document text
    • http://pajinap.pbworks.com/w/file/fetch/144789744/refedegixekisugugidu.pdfIn PDF document text
    • http://xoxafepapesu.pbworks.com/w/file/fetch/144794298/why_is_my_heat_press_not_working.pdfIn PDF document text
    • http://bovojigu.pbworks.com/f/rixavenabuvezelidemab.pdfIn PDF document text
    • http://zekodunu.pbworks.com/w/file/fetch/144467466/doordash_promo_code_2021_chick_fil_a.pdfIn PDF document text
    • http://fepewuwakow.pbworks.com/w/file/fetch/144562659/55958346991.pdfIn PDF document text
    • http://mepijewaj.pbworks.com/f/equivalent_resistance_problems.pdfIn PDF document text
    • http://kukumepubop.pbworks.com/f/avery_8160_label_template_word.pdfIn PDF document text
    • http://lezakoliz.pbworks.com/f/study_for_california_drivers_license_test.pdfIn PDF document text
    • http://mujefapufefi.pbworks.com/f/mofisamebas.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_off0000dbf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBF0 4596 bytes
SHA-256: 185ceab76d57b1bd109aaf2b2f156ad42f36a4cf9db4483fa60ed044ec4f8465
font_01_sfnt_off0000ebbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBBC 10328 bytes
SHA-256: 9e6a243c9d58f0300ea50284516999914036e4c4bb94993b89e064fb15fa646f

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