Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9248e17b13226c9…

MALICIOUS

PDF

83.3 KB Created: 2021-05-12 01:36:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b8e9d2c97418c8756239f5ebc73db59 SHA-1: 21d54bf5285d1441b74a95d4dc41b2f297d91e54 SHA-256: d9248e17b13226c95a587eb56c7889966a1b795e9b38ae1d2efe0aef7874c45a
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with one heuristic specifically identifying a 'PDF link farm' pointing to 'http://trendmobile.ru/gozexajosoxarekovesimahqjix.pdf'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content.

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://zajinet.ru/strik?utm_term=lakshmi+ashtothram+with+tamil+meaning PDF link annotation
    • http://trendmobile.ru/gozexajosoxarekovesimahqjix.pdfIn PDF document text
    • http://7lessons.space/are_finger_tattoos_allowed_in_the_navyxfjgn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493209/normal_5fd2fe89ba75b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474719/normal_6044135b34863.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/00524d4e-65c9-4650-8feb-750b63d29bb4/23982181491.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f32906b5-c4d0-4587-813c-9cc1db467a78/89250036826.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c05848e-1dfa-40e2-a1e9-d27495838a46/letania_del_rosario_catlico.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5df821f4-63a8-4b99-bd25-6aabe3833507/burozufatuxuwujoris.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2990129d-7710-46a6-8928-d3e27ff8b0f0/81341184053.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df0567f1-e879-4320-94ac-638f897cd800/85342436807.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b5d55f7-8dc1-42ea-8c31-ad8c2bb8207a/angel_care_baby_bath.pdfIn PDF document text
    • https://e8677ced-6330-435e-8237-200fb10408a4.filesusr.com/ugd/a4c1fa_0de7096a3221409aa80b400b8a237105.pdf?index=trueIn PDF document text
    • https://288c7b4b-0494-48f6-8ee2-9dd519b96b0a.filesusr.com/ugd/a107db_8cc600ad1bd54a74ab6d0051635a9b49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/5099c5fd-b8b4-4359-b54e-d781ec9ad8c4/66502126810.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7f2a0219-0a2b-443a-9d26-8032542118fa/grade_2_english_worksheets_south_africa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e848b8d0-6c04-4196-8abf-80e41546dc7f/vikisuvawebodenofofajoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/06c457e5-278a-4b76-9a27-2f499b64ba99/25652774625.pdfIn PDF document text
    • https://61df3396-90b5-4b69-a3ae-475c9da6ebc5.filesusr.com/ugd/516574_477c6bd70df2479492a53f506ffed8a5.pdf?index=trueIn 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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC8 4984 bytes
SHA-256: 65d110a54bd7f818ff9dc72346587fc363c5f0eb6e0cc901151cec8554fa22a1
font_01_sfnt_off0000fc9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC9C 12720 bytes
SHA-256: e57af0428a61ec98df29255934ff13fefd02f21a187f2a39fb7eecfc3af57f65
font_02_sfnt_off0001249d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1249D 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
font_03_sfnt_off0001329e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1329E 3268 bytes
SHA-256: 239f62896a362cee99164294bd9c6db5c8141ff0df415fcfa347ffb0673b2d8d

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