Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f35e2fe63fa67e9…

MALICIOUS

PDF

150.6 KB Created: 2021-04-01 03:51:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 2e9268c5e5782ee0db31effd76befc81 SHA-1: fe428f000dd1ccbc9857ac663d8b321da32a0690 SHA-256: 2f35e2fe63fa67e93c53cd1a395c7c285090ae3adc33fdf6eedb9938a2abce41
66 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many pointing to disposable hosting, and a heuristic identified it as a link farm. The ML classifier strongly flagged the PDF as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect users to malicious content, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 4

  • 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://midufefew.ru/award?keyword=graphene+supercapacitor+pdf PDF link annotation
    • https://cdn.sqhk.co/nuwezomu/iMihjjr/cuballama_tienda_online_celulares.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404299/normal_6007a8a4a9336.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405459/normal_6004403981ca2.pdfIn PDF document text
    • https://cdn.sqhk.co/dolitife/jijJhi4/55975268804.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387929/normal_5fd048bd4c4ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402520/normal_603b15c497674.pdfIn PDF document text
    • http://nurokojo.mypressonline.com/88027102711.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467979/normal_5fdb1de9c8914.pdfIn PDF document text
    • http://kujunat.medianewsonline.com/desavaxamaxuk.pdfIn PDF document text
    • https://cdn.sqhk.co/denidugabuni/JcgejeO/assistant_manager_retail_jobs_hiring.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4466398/normal_604fde320f6b0.pdfIn PDF document text
    • http://lapitubemexidi.mywebcommunity.org/odyssey_fagles_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/fufejapopunu/dZCgjhe/71147496825.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373753/normal_603beaf64c62a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_602264dd896ee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482629/normal_604b9e02006ee.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
    • https://uploads.strikinglycdn.com/files/b503aff0-4e3a-46d8-bae7-1353458f80dd/zurunopinekikobuluwirew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33fa3fb8-c487-4738-b286-e8bcbd71968b/humayun_ahmed_movies_youtube.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/differences_between_sociology_and_anthropology.pdfIn PDF document text
    • http://safedoguno.onlinewebshop.net/20514444562.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c6c6db4-a833-456f-b616-c001a66b34f3/what_were_the_economic_arguments_for_imperialism.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e2a526e-f4bf-49c0-817d-c1b960fecc2b/vosono.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e976f316-c6d4-4341-b395-88b289056706/vintage_bernina_830_record_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8befd2df-3278-4b3f-8e64-1b310c8ae9b2/botuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0b384cd7-f7b3-4ea4-a913-d33101edb07c/tawafade.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001ca3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CA3F 8712 bytes
SHA-256: 8a5bff0446a7dff8aa918a0bc3129847ceb7d2f95f22435a33ccbbef017d66e1
font_01_sfnt_off0001e779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1E779 5124 bytes
SHA-256: 9b2fad6a0442047524f6ca0bea2a3019d069a1b268e1ea9c1c374d63661d2fd8
font_02_sfnt_off0001f8df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F8DF 14900 bytes
SHA-256: d5d2ac42f092a5864e0ffbeae6dfcc2033f3ae514dd7be4da47af9eb4a46bfa2
font_03_sfnt_off000228ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x228CE 16060 bytes
SHA-256: 2d958bd008b8db5b33092f112e99c856adbcc0a100e950d14ff814b784be6357
font_04_sfnt_off00023d62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23D62 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71