Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b047c8379d28fcf…

MALICIOUS

PDF

78.5 KB Created: 2021-01-27 04:51:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c58236c0d7b1b7bf57a5308e555ec86c SHA-1: 90759cc20e44f0921f97e4c78667143a57c4b4e0 SHA-256: 2b047c8379d28fcff816a06b617130fd6ea99759f2187aaab1632210454b991e
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains a large number of external links, many of which point to PDF files hosted on file-sharing services, suggesting a link farm or phishing campaign. The document body, though heavily corrupted, contains text related to a sensitive query, likely intended to trick users into clicking the embedded malicious links.

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://crophysi.ru/123?utm_term=is+6.5+inches+big+for+a+14+year+old PDF link annotation
    • https://venevivoxeda.weebly.com/uploads/1/3/1/8/131857756/be5798bb951.pdfIn PDF document text
    • https://sasominafa.weebly.com/uploads/1/3/4/3/134362810/navizalobipu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476938/normal_5fe96845e10e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464865/normal_6007a356f093e.pdfIn PDF document text
    • https://cdn.sqhk.co/waderapal/jfeshjd/tetajivisozokuzawasizan.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/1807080.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxinugad/jdahiih/one_dollar_store_around_me.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483610/normal_5fc7241cda827.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366014/normal_5fc871f73907c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416326/normal_5fdb7bd2224ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365541/normal_5ff9df8426d59.pdfIn PDF document text
    • https://cdn.sqhk.co/videgogaf/ijFJhax/free_video_call_online_app.pdfIn PDF document text
    • https://buvaranugabenu.weebly.com/uploads/1/3/0/8/130873820/4363de84.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zusobudem.epizy.com/fuwumunesogepo.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_off0000f4ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4EA 5912 bytes
SHA-256: fd22d0ac8c861612986116e243ba8c3ec5a9f38cc0d2b4b525b160319bbc2524
font_01_sfnt_off00010920.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10920 10564 bytes
SHA-256: bbb824824213444a1671b50641330c6da3b07f3552dd658788a386c2daca2de3

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