Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc5c568d8ec04c1…

MALICIOUS

PDF

70.8 KB Created: 2021-03-14 18:14:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a458131e02ea0c2e3806acbdc6b5ebd6 SHA-1: 7c9f23b02c6a75f95321e0e621140340e9f823e8 SHA-256: ddc5c568d8ec04c127464da979a879c965e4977d2a670d84da25b37f362494b0
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying a 'PDF_SEO_LINK_FARM'. One of the primary external URIs points to 'https://xezojetit.ru/strik', which is likely a phishing or malware distribution domain. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://xezojetit.ru/strik?utm_term=fire+and+ice+hvac+dickinson+nd
    • http://tututot.mygamesonline.org/4203316527.pdf
    • http://jaxagogilexet.sportsontheweb.net/mavikuwokuruji.pdf
    • https://cdn-cms.f-static.net/uploads/4470828/normal_6048cb52c1534.pdf
    • https://cdn-cms.f-static.net/uploads/4427077/normal_602724c37a268.pdf
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fdeef8ea38cd.pdf
    • http://mobufuwiwid.medianewsonline.com/60774630491.pdf
    • https://cdn-cms.f-static.net/uploads/4393181/normal_6043117492ff3.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_6044248e4bfe2.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://b3a1a1c9-4f8f-4fb8-b7cc-7339030cc889.filesusr.com/ugd/162fe6_493b075acc66404cafbcdc75a48db97a.pdf?index=true
    • https://s3.amazonaws.com/wumodukubaru/wexazijatapodu.pdf
    • http://xolavozezimodan.onlinewebshop.net/nuwujekasaxun.pdf
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_e45d7c8171d8447db1a575c05bcc9b69.pdf?index=true
    • http://nukivamo.myartsonline.com/focusrite_18i8_3rd_gen_review.pdf
    • https://s3.amazonaws.com/suxuzubojut/94747522852.pdf
    • https://1fa67a36-2e8b-44cc-a955-751d80433762.filesusr.com/ugd/d85e51_57895c0e7875427d859c24837e094e9c.pdf?index=true
    • https://s3.amazonaws.com/xovajukoxin/dunagopilevuzu.pdf
    • https://cc46d2ba-e7cf-42f8-aa62-b015a0c17ef0.filesusr.com/ugd/d180c3_d73df7f80555437488e16c3c657de805.pdf?index=true
    • https://abbf68a8-5b21-4996-91be-11266bd273ed.filesusr.com/ugd/9374a7_02972282dfad4d1e97c0182b3872c690.pdf?index=true
    • https://af30af13-e0b7-4de0-aca7-7783c01eade2.filesusr.com/ugd/9757e7_e8cb899246444b51830a67a1c2dea33b.pdf?index=true
    • https://ad858f6a-7bbb-416d-9365-e04d7986ed9b.filesusr.com/ugd/3c9ac1_7f1c9c2a77884d91888cb0a3a0d54f4e.pdf?index=true
    • https://29474179-7c7c-44ae-84e0-3c37792f2e25.filesusr.com/ugd/7f817d_0024a3832374401b88b1ba932c2c8e59.pdf?index=true
    • https://eee5dff6-7331-416e-acdf-593d0c386862.filesusr.com/ugd/21e9e0_f7f085a1171f405baff9c03fadc26bc8.pdf?index=true
    • https://a1359116-1358-4cde-afc5-3600b4bb50db.filesusr.com/ugd/3b0c81_cd56cd6fb17f4f2ab4234e984293f1b8.pdf?index=true
    • https://24a70dd4-b549-4b9e-9c0a-6eea45ab85ad.filesusr.com/ugd/ab0c63_a2c9d94195444c9da8cf07baf2693df0.pdf?index=true
    • https://s3.amazonaws.com/pujirageg/jorofakisiwifuj.pdf
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_f1819c169a9d42d68b1ba321af685d54.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_off0000d891.bin
238fccb45e5ac8bafe38d735a78613615e5d3d4d1e4960550e245439828ca2d1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 5076 bytes
font_01_sfnt_off0000e9d1.bin
9141fd836284b37e872888055b41cb5bd0381a7c23ea6070eb01d86ef74dbf5e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9D1 10404 bytes

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