Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef2d27a9936f74…

MALICIOUS

PDF

78.6 KB Created: 2021-03-18 04:49:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11f42d12261f230c4796e57bd5934eff SHA-1: 16f23a45ee0bc9f8e5bf07316dab1474e49cd070 SHA-256: 97ef2d27a9936f7473482d87bcdfc681cce8bf476fc6f7bd4607c0d98bcaa25a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting a malicious intent to redirect users. The ClamAV detection and ML classifier strongly indicate this is a phishing or malicious document. No scripts were extracted, but the presence of embedded URLs points towards a redirection or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://xajibur.ru/award?keyword=allopurinol+bula+pdf
    • https://static.s123-cdn-static.com/uploads/4373304/normal_5ff2d84ac078e.pdf
    • https://static.s123-cdn-static.com/uploads/4380403/normal_5ffc56fc730d4.pdf
    • https://cdn-cms.f-static.net/uploads/4467571/normal_6018e0320f1ea.pdf
    • https://cdn-cms.f-static.net/uploads/4382193/normal_6027ef1611b36.pdf
    • https://cdn-cms.f-static.net/uploads/4488330/normal_60462bfd52042.pdf
    • https://static.s123-cdn-static.com/uploads/4470677/normal_5feca1ca14077.pdf
    • https://cdn-cms.f-static.net/uploads/4444374/normal_6020fe4ca117a.pdf
    • https://cdn-cms.f-static.net/uploads/4485004/normal_6050fe54e767e.pdf
    • https://static.s123-cdn-static.com/uploads/4469638/normal_5ffabbcb70061.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_d2b7273974c149f5b02f1bcc9b3ae302.pdf?index=true
    • https://9907981b-0bc7-4fd3-a434-169f7cdadf42.filesusr.com/ugd/575363_14e01f29c7ff403c866629de3e75fb34.pdf?index=true
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_caf98678661f4090a1a8469ab8289cbf.pdf?index=true
    • https://s3.amazonaws.com/vasofirida/form_1096_box_3_instructions.pdf
    • https://ce83042b-5faf-46b5-bcbb-9b4d05ec7d33.filesusr.com/ugd/a31856_5d4390d85f83423eb9e4ee563fa7bc1e.pdf?index=true
    • https://d4f4546a-a836-4b3d-8651-c56b89608eca.filesusr.com/ugd/3e9e83_90c5d0e78a034963b7c91863b920b602.pdf?index=true
    • https://52f9d6e5-2fd5-4906-a030-4d12f703b62a.filesusr.com/ugd/297ecd_6d0a5ab57a5a4c65939f45518aa781b0.pdf?index=true
    • https://s3.amazonaws.com/jotizifime/chris_watts_case_report.pdf
    • https://s3.amazonaws.com/tobobowu/spark_john_ratey.pdf
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_e94daf4d2b6043f29845eb6e876aad24.pdf?index=true
    • https://s3.amazonaws.com/musoxifuvitalo/figiwutumibonakapekew.pdf
    • https://b7af6bb9-01eb-4839-ab56-764651de4344.filesusr.com/ugd/2486b5_b124ccf9985941a2b1894c9b0b5ebb84.pdf?index=true
    • https://9e1e9198-0fe7-4103-8084-fdcc6befb8d5.filesusr.com/ugd/2f7815_7a030b45550f40408eca2e06bde997a9.pdf?index=true
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_0714132bf8114499b5d8436dee858ee4.pdf?index=true
    • https://b962d5b8-8819-42e3-9ba3-d95e8366760e.filesusr.com/ugd/f51585_1185afa5f170489680fc0ae491abfe64.pdf?index=true
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_379d7d52ae7f41d7b31c6cd011f85a71.pdf?index=true
    • 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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6d1.bin
6c73be1275c7bf324090e3c89cccf48834ed017ebf1c95cfe82c6fa3b1aa91b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 4984 bytes
font_01_sfnt_off000107d0.bin
ee0c1eca31364c8efad95813ae4f5faf66587a6ebb3424f0d9820c325a17d141		 pdf-font-stream PDF embedded font (sfnt) at offset 0x107D0 11068 bytes

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