Malicious PDF — malware analysis report

Static analysis result for SHA-256 999a970608177dc4…

MALICIOUS

PDF

98.0 KB Created: 2020-11-21 06:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b758eb92be9ea511853447c0efbd43b7 SHA-1: 25eb49c5e48db8609b1f6ee418e06d4a8e307143 SHA-256: 999a970608177dc41070abfda449f9a708c1f336813f84e7ebe2c0dd55a759e8
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or redirection mechanism. One of the embedded URLs, 'https://trafffe.ru/123?utm_term=a+capital+cursive+t', is a primary indicator of compromise. The presence of PDF-specific heuristics and the overall structure point towards a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://trafffe.ru/123?utm_term=a+capital+cursive+t PDF link annotation
    • https://papunagaku.weebly.com/uploads/1/3/1/3/131384156/xenefu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403563/normal_5f9dd06f5d443.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5f98c79b51ad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474457/normal_5fa9bfc17685f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477400/normal_5fa6e49caa7fa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371807/normal_5fa21cae0b2ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424036/normal_5faf7a17053ed.pdfIn PDF document text
    • https://tuzafezinaxav.weebly.com/uploads/1/3/4/3/134319976/c59a6a43d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466379/normal_5faab44589dd3.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/d1226a21-9b43-4c44-8633-b6e12de1911a/supozoxevimape.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31bfa5f3-9c40-41c1-9d1e-7b318a24360c/kativomafuvegawosezete.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e1c2d72-7281-4761-b985-6fdfe5cb18a7/airforce_delta_storm.pdfIn PDF document text
    • https://s3.amazonaws.com/gelawiweza/cracking_the_code_interview_github.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
    • 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://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 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000f198.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xF198 3388 bytes
SHA-256: d2c7340bc2f804d8c65407cc67f0dc863e182d61fee903a302d02ee1e13b2a38
font_00_sfnt_off0000c2c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2C5 11200 bytes
SHA-256: 3555e0f8ad3122c8fa8c558c87c14a58a0866839aa01622885de26c6cdb47751
font_01_sfnt_off0000e0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0A4 4976 bytes
SHA-256: 69ce052b12efb2f32ce4c532c37c2e34b2735883006c7aae01fbb1a1bfb809ef
font_03_sfnt_off0000ff5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF5A 28088 bytes
SHA-256: be7fc2e9bdabc0b3bf42741b394b4ada390c550f7463f39d403146d6650862fc
font_04_sfnt_off00014bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BFE 19400 bytes
SHA-256: a92b14d71ffb600e8b9e1b69bac79fe080b0f379ec8bd2067857fa33fd10e11c
font_05_sfnt_off00016abf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ABF 6076 bytes
SHA-256: e1a25f2b94792584a836f1cfaf99e0afb7baaae4c0e52e83303cf2f8273f95d1

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