Malicious PDF — malware analysis report

Static analysis result for SHA-256 3caa2686a5061790…

MALICIOUS

PDF

97.2 KB Created: 2020-12-27 22:17:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 06e1598164fabee1768d250785b5bbec SHA-1: 7297359a4887a63415d4580372d42c26447e438f SHA-256: 3caa2686a50617903b054e6501d748fc0f886aa8e1f299ddcd81b5469e3caf6e
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 suspicious or unknown domains, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. The presence of embedded URLs and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirm the attempt to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

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=icy+hot+cream In PDF document text
    • https://taxajoberaruvu.weebly.com/uploads/1/3/4/3/134320235/9981980.pdfIn PDF document text
    • https://lofivate.weebly.com/uploads/1/3/4/3/134307733/fuvureja_gamubobab.pdfIn PDF document text
    • https://boguvetasitob.weebly.com/uploads/1/3/1/3/131380850/7b9c45c794f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://s3.amazonaws.com/fogibi/27298166387.pdfIn PDF document text
    • https://s3.amazonaws.com/zemunomipazikez/aix_os_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tesapibebujep/lymphadenitis_treatment_guidelines.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/5091126135.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/jefofibinaniz.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/51084971644.pdfIn PDF document text
    • https://s3.amazonaws.com/kujapomib/73875988292.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://sinhala.sourceforge.net/In PDF document text
    • http://sinhala.cvs.sourceforge.net/viewvc/*checkout*/sinhala/sinhala/fonts/CREDITSIn PDF document text
    • http://www.gnu.org/licenses/gpl-2.0.htmlIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF8D 4168 bytes
SHA-256: 86263a27a515415f383347c5348025de5e66200abc6db43d1582f1c535e60dc5
font_01_sfnt_off0000fcfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFD 4868 bytes
SHA-256: 34a28df95e570216ec3b6946ebcab09d52570dc90b059cd642a59924abe6b950
font_02_sfnt_off00010d24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D24 2864 bytes
SHA-256: 6f924c2e61306644427910ef49bc79d306d12f5fdd27697861ee941244f67474
font_03_sfnt_off000117ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117EC 2904 bytes
SHA-256: ae8cbfff44ea6205f71109bc949b107b29d11b78b0835b687b1f2bbc00386228
font_04_sfnt_off0001243e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243E 14312 bytes
SHA-256: 23f8119bcc1503dd439323e38f8e6be4dd9d98520170414679b52695af0758c3
font_05_sfnt_off00015367.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15367 17464 bytes
SHA-256: 437ff6d45079e31dc741f6c1b642b3c4ef9c3a70e52fb33080085e8b7c7b52cb
font_06_sfnt_off00016d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16D25 2004 bytes
SHA-256: 2e26f8f2edf0ab4a481426fb6ec8c0d485dd17fce6d182c1a140fa674a3f2dd3

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