Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba3be552ccc06575…

MALICIOUS

PDF

99.2 KB Created: 2020-12-05 17:12:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: fc75e5ace1e62fecc7efa6015c88f792 SHA-1: 7a297da327856202d61fccf2425a02a7d0dae8db SHA-256: ba3be552ccc0657526c30ed80fe8e0a946ab93458295daf2a6b88bc1798a4c67
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The primary function appears to be a link farm, with numerous external URLs pointing to other PDFs hosted on disposable domains. This technique is often used for SEO manipulation or to distribute further malicious content, aligning with a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://trafftec.ru/123?utm_term=is+matrix+product+commutative PDF link annotation
    • https://mipirizu.weebly.com/uploads/1/3/2/6/132682564/9345559.pdfIn PDF document text
    • https://gabodudir.weebly.com/uploads/1/3/4/7/134717456/294cdfda023a19.pdfIn PDF document text
    • https://judorobizud.weebly.com/uploads/1/3/4/4/134455398/261b1ce3d3.pdfIn PDF document text
    • https://zemutixo.weebly.com/uploads/1/3/4/8/134865820/kinonewerodudilopazu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5f89f55fbed58.pdfIn PDF document text
    • https://bomosaxume.weebly.com/uploads/1/3/4/8/134892214/3853149.pdfIn PDF document text
    • https://lugagixoweliw.weebly.com/uploads/1/3/4/2/134234548/8459162.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370785/normal_5f88465aa8b2e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5f8e1a714f895.pdfIn PDF document text
    • https://rujemadatidugu.weebly.com/uploads/1/3/4/7/134747735/zozeloduxosub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5f23c7c-5dbd-45aa-9f6a-b492d5a82581/41846676462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2926dbcf-6df7-4957-8828-0d8be4258c81/limaxovevolulabaxezudedo.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off00011b8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8B 5252 bytes
SHA-256: 7ddd6a0cd4ef9695cf92dfb7b38134ef71729fc1bdcd641ebfd49eb0ca4b0630
font_01_sfnt_off00012d16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D16 6300 bytes
SHA-256: 33e079d314e8ac6127b1e3ef6c589fac86ee1747e1198796ea12012fa2a002c7
font_02_sfnt_off00013c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C6C 12972 bytes
SHA-256: 221bf1aefeb6e1d61035e7f3c5056834a3959d7d86bc97819fb7e328cc20eb62
font_03_sfnt_off000167eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x167EB 16632 bytes
SHA-256: dfbe5f065e996d15b590a1c86d73a9309831bdd415d21e691b276b6d37c54931

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