Malicious PDF — malware analysis report

Static analysis result for SHA-256 312a2cbe1d25803e…

MALICIOUS

PDF

71.5 KB Created: 2021-02-16 00:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 2ec65e70e338586ce51bbf6e4d1df85e SHA-1: 954ab652cd7b7924f2096626a3bef4090826d79d SHA-256: 312a2cbe1d25803eb3cc29a5b5f5c041556ccfcb964a1f668eaab0133b468019
156 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 0.9997

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 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.
  • 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://jottigo.ru/strik?utm_term=chinese+boy+names+with+characters+and+meanings PDF link annotation
    • https://cdn.sqhk.co/kugefiruxat/ibRgdih/gajikinukeruxijazaletid.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378843/normal_5fe1ea33267c1.pdfIn PDF document text
    • https://pevunefimexog.weebly.com/uploads/1/3/1/0/131070247/nakepezana-tijefawexesis.pdfIn PDF document text
    • https://vigodabazo.weebly.com/uploads/1/3/4/8/134872933/gepivo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375206/normal_5fe2f523d5d1b.pdfIn PDF document text
    • https://dupagerenukuxat.weebly.com/uploads/1/3/4/7/134751723/garafug_mobumevikelu.pdfIn PDF document text
    • https://debuvubuni.weebly.com/uploads/1/3/4/8/134846467/vufuwikijeratilalina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460981/normal_5fe72c07b278a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mugudupo.epizy.com/isopropyl_chloroformate_cas_no.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/new_year_shayari_image_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/31728334795.pdfIn PDF document text
    • https://s3.amazonaws.com/wobuzisibal/dwellstudio_skyline_crib_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jopomodilamego/42403089667.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_off0000dab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB0 5560 bytes
SHA-256: 713233658b97df897cc9123f7940aa2dceaa553f7a6be6f741334f3c7c60ed22
font_01_sfnt_off0000ed7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7F 10492 bytes
SHA-256: 940eb86953aba840f58789ea527dbf34fbf4057c14dba104520cdf7df2f05d8e

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