Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aca0af2ae4d9092…

MALICIOUS

PDF

77.3 KB Created: 2021-01-03 04:47:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 936e8edbd4b9a2c43e01643a4baef0bc SHA-1: e90385b28a513e31fbbac7dc16f1597cf27faef9 SHA-256: 2aca0af2ae4d909201e5e612c32a796f72ce1aad2758992037ce31f3f7744544
156 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains a link farm with numerous external URLs, one of which is 'https://trafftec.ru/123?utm_term=how+to+find+x+intercept+of+a+function+calculator', suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, appears to be related to the lure of a calculator for finding x-intercepts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafftec.ru/123?utm_term=how+to+find+x+intercept+of+a+function+calculator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376625/normal_5f8e8a4bc010b.pdfIn PDF document text
    • https://ximetekorexuven.weebly.com/uploads/1/3/4/4/134489871/mibujim_tiluluweja_desuzuxuvuviji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502248/normal_5fc52c4902a10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd7bfaec8ef2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368735/normal_5f990ceec08b5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f94d9f430557.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/c6f50755-8fee-4fe4-beb2-e3ff5c86e1e4/stickman_archer_legends_codes.pdfIn PDF document text
    • https://s3.amazonaws.com/bojafazes/cosmos_episode_3_stream.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3686c593-5908-4c5a-8c0c-a26a3197ea5b/nuwobinewusumasogazun.pdfIn PDF document text
    • https://s3.amazonaws.com/woberiz/hey_mama_jonas_blue_song.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/21697864467.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f7892ef-a29d-47f2-b863-4b28889d9b28/how_to_reset_my_ipod_touch_4th_generation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44c4de43-d512-4453-8ff4-3b0f5b8acc9b/ritej.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2afdc8f4-904a-4ff3-a474-3e498b61014c/vefinuveteduvi.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/wufadiga.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_off0000ce66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE66 5092 bytes
SHA-256: ff13cd4609eeef2dff4cf34d78aff182c73a2ea48754e867823e0261105522b8
font_01_sfnt_off0000dfd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD3 1584 bytes
SHA-256: c0779dbf6e112e58dd3ef75ce297746ac830bbd9ebd9dffed3f747dd95a7da8e
font_02_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 13244 bytes
SHA-256: 9efa8f03d1045ce8d4504059faceb5aadcddef5f521e3e2f99ae68dd2fa62c57
font_03_sfnt_off000112c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C2 16080 bytes
SHA-256: a534b91c4ec3d8756e3a834051570443c69e75f38d6508a28567570861ffac3d

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