Malicious PDF — malware analysis report

Static analysis result for SHA-256 b38bad06a407970e…

MALICIOUS

PDF

76.3 KB Created: 2020-12-06 23:44:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 75944691fc8b22b4d479c5346f0d46ca SHA-1: ba140e560a3664ec4802a4359cadf3e345cd6449 SHA-256: b38bad06a407970eeda912299df698643fb8e8f18e3d588b97feeb169af0bda9
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with several pointing to known malicious redirectors or potentially malicious domains. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM indicate a deliberate attempt to create a link farm for malicious purposes. ClamAV also detected this file as Pdf.Phishing.Trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://cctraff.ru/strik?utm_term=simple+enneagram+test+pdf In PDF document text
    • https://jonipafatanepa.weebly.com/uploads/1/3/2/7/132741476/xaxup.pdfIn PDF document text
    • https://pelimabogex.weebly.com/uploads/1/3/4/6/134685965/leziwus_rasewuroram.pdfIn PDF document text
    • https://sazunanu.weebly.com/uploads/1/3/4/5/134596286/dikazesenumanes.pdfIn PDF document text
    • https://topejaliwas.weebly.com/uploads/1/3/4/3/134305960/veravu_vimoxemoguwimom_bezipif_repijo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc0f1b0084698658e5e73ac/t/5fc1f315eaf37e3b64e1cf55/1606546201651/58351293605.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc64483ff13940aa2640bfd/t/5fca87860e456138b04c06a4/1607108489795/us_stock_market_trading_hours_gmt.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc6675ec14dfd36fe172514/t/5fc96556c8e99239e0012547/1607034198510/world_war_2-_ww2_mod_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1ff6dea3-f689-4420-8fdc-0b3c93077528/96290603453.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b16be10d-fc63-4795-882d-e998b8802ac2/41738711384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17ff5000-ccf7-44a4-9f89-57e90403eaea/leviathan_extreme_unsynced_guide.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c8b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8B2 5464 bytes
SHA-256: f4a977b8e03928285c303de620eef4c0e97a444c2ac1d66a3c8051f81c93c9db
font_01_sfnt_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 3220 bytes
SHA-256: 8b8148cfc80fd5c7d3235df310225dab4500da2d9906e98724d9d887acae100f
font_02_sfnt_off0000e853.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE853 10920 bytes
SHA-256: 0394db8023d611d8f5a267b329af5b405c0543c6bec05c686d82d095922ba820
font_03_sfnt_off00010da3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA3 16116 bytes
SHA-256: afbdbd02dec82d9be1e07df9ab92004d6e2996c86bdcb9c83a2c1f8ac0d08daa

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