Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc332028148e0877…

MALICIOUS

PDF

78.9 KB Created: 2021-03-09 00:22:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 27c46344518b051b65b48b5820932bb9 SHA-1: 162611b5523cdd1e654999e817fc2581c8c4bf89 SHA-256: dc332028148e08776da0a1b8195abc2699d2ddc8afaf56f65a5efef232f295bf
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://ponafet.ru/123?utm_term=aambala+tamil+movie+video+songs PDF link annotation
    • https://cdn.sqhk.co/zetuzire/jgsbihj/pictoword_level_481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370270/normal_6045eb2163a3e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386591/normal_5fd798d3e690f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452846/normal_603f2b701683f.pdfIn PDF document text
    • https://cdn.sqhk.co/bitizulokiva/jejcWZb/bouncing_ball_gif_transparent_background.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404503/normal_5fd8200b445d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379969/normal_601b2675a1972.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476564/normal_603710d83f4dd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406464/normal_5ff755df65a87.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370275/normal_5fd6ccff6e4c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454973/normal_6034f63f56547.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461786/normal_603cce573ca93.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412909/normal_5feb5d51bc6b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408712/normal_60306c6c962ea.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://fukesok.rf.gd/how_to_set_up_wansview_ip_camera_on_pc.pdfIn PDF document text
    • https://71da2aa5-51c3-4f2c-ab18-08bbbad20131.filesusr.com/ugd/d216cb_b8ed83bd36c240f28008b796be03160e.pdf?index=trueIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_ae4008834dc44600a6f3b9be3fc296de.pdf?index=trueIn PDF document text
    • http://lokemuwebofeg.rf.gd/17745517036.pdfIn PDF document text
    • https://02408c19-b9f6-4996-a596-1d5b7e46c8d3.filesusr.com/ugd/c83fdb_f49d5e3830c246af8fcbc76312b6186f.pdf?index=trueIn PDF document text
    • https://e0a971b2-7104-4718-9e5f-4f17d768618f.filesusr.com/ugd/6d43b6_79a2e83e9cca4895924b76192a42fd49.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_f337716f73254e25a2d35c3ee5d8c9e7.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e938.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE938 5028 bytes
SHA-256: ade13b93a4cd9dd0248cdc796e6d8ac18112d8b9c0217b38e6aa9ecc9fae8541
font_01_sfnt_off0000fa3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA3D 10984 bytes
SHA-256: d1b5ca8a65d45c00cbad1978b202d9111b43e9df9d09744446923c5874718b13
font_02_sfnt_off00011fa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FA3 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c