Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2a2cba562d9f25c…

MALICIOUS

PDF

78.8 KB Created: 2021-02-24 18:42:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 42957ececa61f1b7c7f161139c36ca2c SHA-1: d7c6f9034cb7299341d3ede178fa70b57e375af4 SHA-256: c2a2cba562d9f25ca533aa5fd0250ae89568642cadb4f5ec1b6a1faa1a352d30
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many pointing to disposable domains, and is identified as a link farm. The presence of external URIs and the link farm characteristic suggest an attempt to redirect users to malicious sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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/strik?utm_term=how+to+interpret+line+graph+example PDF link annotation
    • https://lafajadisevo.weebly.com/uploads/1/3/1/4/131454770/973010.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/how_to_become_a_good_husband.pdfIn PDF document text
    • http://kirakexig.mypressonline.com/diary_of_a_wimpy_kid_rodrick_rules_book_summary.pdfIn PDF document text
    • http://lamakexo.scienceontheweb.net/72501394552.pdfIn PDF document text
    • https://cdn.sqhk.co/gewanunu/gc3t0D9/bouncemasters_mod_apk_1._1._5_download.pdfIn PDF document text
    • https://cdn.sqhk.co/vugomupuzisa/gzgj6wE/zedge_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/YJif5ib/47152368592.pdfIn PDF document text
    • https://maparezoja.weebly.com/uploads/1/3/5/3/135321508/20a84a5bd7e.pdfIn PDF document text
    • https://rexekimat.weebly.com/uploads/1/3/4/0/134017736/9f45af5216841e9.pdfIn PDF document text
    • http://xawegap.mywebcommunity.org/samugu.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/paxuvagal/bluetooth_driver_for_windows_8._1_samsung.pdfIn PDF document text
    • https://s3.amazonaws.com/nonipesikiri/acronis_bootable_iso_free.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/signs_a_guy_isnt_interested_in_you.pdfIn PDF document text
    • https://s3.amazonaws.com/falevi/5035199842.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_off0000ead5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD5 4964 bytes
SHA-256: 4f7e891f10e41fe8cc630362a2f4fb513d8c7fc849dd9ef90a45726ce753dfa8
font_01_sfnt_off0000fb8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB8F 10636 bytes
SHA-256: c2d364849b167b6325bc1592186803e8b98acc9056ef4cc65bfaf1e150b6ed7c
font_02_sfnt_off00011fe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FE6 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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