Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb1d1dd77d646e2…

MALICIOUS

PDF

70.4 KB Created: 2021-03-15 03:23:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5ab50f89d3333cb1c96ca6232e290f3 SHA-1: 4a6b59790a70269a1e941485c70de99afbe95e94 SHA-256: dcb1d1dd77d646e2c5d44734aebe1cf9fc8521e9d16e43a9eec5b8cbb213e5f7
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are part of a link farm designed to manipulate search engine results. The primary malicious URL identified is 'https://golowaki.ru/wix?keyword=1984+part+2+chapter+5+questions+and+answers', which is likely used to redirect users to further malicious content. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://golowaki.ru/wix?keyword=1984+part+2+chapter+5+questions+and+answers
    • https://cdn.sqhk.co/jojewezalika/QhdojfF/ladejowesa.pdf
    • https://tedajurilazunu.weebly.com/uploads/1/3/0/7/130739962/tumozomeru-wezekigufa.pdf
    • https://mewurotimopu.weebly.com/uploads/1/3/1/3/131381658/2236232.pdf
    • https://cdn.sqhk.co/gadakoferupa/ajgbCid/waze_traffic_app_toronto.pdf
    • http://jakor.pro/hp_4500_printer_cartridgev1b2z.pdf
    • http://swiss-gear-top.xyz/how_to_reset_logitech_wireless_keyboard_k350ejfan.pdf
    • https://famuvotatag.weebly.com/uploads/1/3/0/8/130813835/tabelixud_kafadefivexiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://1eb42bdc-3da6-4b32-b75f-4382f1721f8e.filesusr.com/ugd/35474d_2810c11a6153422bb1e42136b0768fb9.pdf?index=true
    • https://8ab8d0a6-ebcf-4503-ac90-3c5d9a0926ce.filesusr.com/ugd/8585d4_6b73952033d740e3a0b3eea10cca1267.pdf?index=true
    • https://0d3c4653-ec4b-4b04-9c20-59e348ba858e.filesusr.com/ugd/62200f_a095676534004868b0bc841d4ae853b7.pdf?index=true
    • https://c245485c-e1a4-4c5a-9a2a-c465a95e53c8.filesusr.com/ugd/25f824_96a73959cd644b939b33e3ab23f39582.pdf?index=true
    • https://c8070bf9-ed42-4c5d-8eb8-ca35ee70f136.filesusr.com/ugd/d38238_fb1197b053da42358e2b17a40d380938.pdf?index=true
    • https://92fa68c6-d088-48c5-94d9-776fe0504fc0.filesusr.com/ugd/5a053b_a9691f64d9b04b6bab8be91682593a82.pdf?index=true
    • https://4ac36a2f-1533-488b-b282-cf34cdace458.filesusr.com/ugd/bcfc12_20bfe62f7c63469192015db205be7f78.pdf?index=true
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_c7cab319a1e2470cb8366d24db02d519.pdf?index=true
    • https://9610c43f-1b2a-4a8a-b660-75aaf3908198.filesusr.com/ugd/286fb8_46fa6b24bd7a468f932893e7f8315e36.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_off0000d3f3.bin
742d96e05aad5ed40d2ce630e457c4b804151eabb5a01002b0a15dc0588024fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F3 6000 bytes
font_01_sfnt_off0000e86e.bin
76529421fb52588ff551e25eb5e7a7a82c6e616724fb541e904e687df4031a04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE86E 10580 bytes

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