Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cd22372056f722…

MALICIOUS

PDF

82.2 KB Created: 2020-12-28 12:04:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d8dc9a8f4ef6014178885e2efb92db7c SHA-1: 11f36b3bc0c0d76e8d4db84d80285a00524284d5 SHA-256: a6cd22372056f72293f926df1b2d94e56c85bf598ef26c12878b1d817e9ac7a6
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on dynamic DNS services or file-sharing platforms, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of embedded URLs and the heuristic for a 'SEO Link Farm' point towards a campaign designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://traffine.ru/123?utm_term=we+are+monsters
    • https://cdn.sqhk.co/fuzokikili/bjc6iaq/knights_of_labor_union.pdf
    • https://zusadubojurumez.weebly.com/uploads/1/3/4/7/134703186/3509244.pdf
    • https://wefapewirevuvik.weebly.com/uploads/1/3/4/6/134667644/d5995130e.pdf
    • https://bupotovivo.weebly.com/uploads/1/3/3/9/133986694/vusugiwuba_zifuzuvi_wazik.pdf
    • https://cdn.sqhk.co/lapefuxolu/lczzkje/68501745378.pdf
    • https://cdn-cms.f-static.net/uploads/4477183/normal_5fbf15f2eb630.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mogedozara/kokedafulomax.pdf
    • https://s3.amazonaws.com/rowubunak/8058827756.pdf
    • https://s3.amazonaws.com/warapagefasovi/girededobuwukevun.pdf
    • https://s3.amazonaws.com/folexapurilowe/24903013819.pdf
    • https://s3.amazonaws.com/jenagubadopi/hpu_shimla_date_sheet.pdf
    • https://s3.amazonaws.com/tapexiw/woxamabevakilepufijo.pdf
    • https://s3.amazonaws.com/xezujuxoz/dearborn_stem_academy_online_learning.pdf
    • https://s3.amazonaws.com/simujix/computer_knowledge_questions_and_answers_free_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed27.bin
570d51ad070f57393f98a8f8a42a80fe86960854808c0017fd3006f4d0197813		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 3352 bytes
font_01_sfnt_off0000f915.bin
092f3c72d0400a37b1986fe76edd62b83b25f09b89c0505f0f301687bdd73a2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF915 4812 bytes
font_02_sfnt_off00010960.bin
b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10960 3720 bytes
font_03_sfnt_off000114c3.bin
f58e969d70b049f83f8b55a0534dda8c9f4fc6fc4d603490ad4194407a74ecd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x114C3 10796 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.