Malicious PDF — malware analysis report

Static analysis result for SHA-256 76abe6d1daf98710…

MALICIOUS

PDF

105.8 KB Created: 2021-04-17 16:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 49aec9deab944462264972a209ac920c SHA-1: c99da7d13728713c6d7d4bd0d4257aacd5b8a4f2 SHA-256: 76abe6d1daf9871066f5c243863ff7d623e301f5fdbab7cbe35e3080b1475548
186 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, indicative of a link farm designed to manipulate search engine results or direct users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://fokemale.ru/strik?utm_term=alex+rider+tv+series+age+rating+amazon+prime PDF link annotation
    • https://jepibuko.weebly.com/uploads/1/3/0/7/130739686/minapomuv-mibumo-medisilefigore.pdfIn PDF document text
    • https://budafamilefa.weebly.com/uploads/1/3/1/4/131452884/5ec93f.pdfIn PDF document text
    • https://nunodovov.weebly.com/uploads/1/3/1/3/131380210/7460772.pdfIn PDF document text
    • https://javumegibevi.weebly.com/uploads/1/3/4/6/134634398/janidiseges.pdfIn PDF document text
    • https://cdn.sqhk.co/lasesekov/joyMifv/bikemaku.pdfIn PDF document text
    • https://bovimifukid.weebly.com/uploads/1/3/4/8/134882826/bubujadik.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/8tE7v7k/special_agent_salary_bls.pdfIn PDF document text
    • https://nodarato.weebly.com/uploads/1/3/4/4/134487471/6017094.pdfIn PDF document text
    • https://cdn.sqhk.co/doxutijewu/qlgiieQ/green_bay_packers_score_last_week.pdfIn PDF document text
    • https://fuxovibafisiboj.weebly.com/uploads/1/3/0/8/130874455/vamowo.pdfIn PDF document text
    • https://cdn.sqhk.co/genamudazunu/iijjwWd/sky_force_2004_game_download.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/vodolomasipog.pdfIn PDF document text
    • https://jedifugidu.weebly.com/uploads/1/3/1/3/131382595/4650874.pdfIn PDF document text
    • https://wapavamo.weebly.com/uploads/1/3/1/6/131637186/getov-mekijaxumowulu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d86ad34a-7df2-4f47-937b-a12ab5abc0fa.filesusr.com/ugd/8cbfce_6c234b1b8ae345daa829b2b4aa776b72.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f8dd413a-e58e-4162-bda9-e9cbc96015ac/29314814677.pdfIn PDF document text
    • https://94aa8f26-b07a-4c24-bdb4-4112657565c9.filesusr.com/ugd/37428b_43f6efd31afa4310b7ca8c8a180598eb.pdf?index=trueIn PDF document text
    • https://ed4d48c2-14ea-47f5-a89a-b82193587323.filesusr.com/ugd/8ce377_441159808e074265ae228e4b83ee4764.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f01df0b2-8d53-4cd3-a241-962fb259d8ac/how_to_open_a_sentry_combination_safe_without_the_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c23002b-e3ac-4f05-a174-4c627a0ab1f0/76523805587.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb45142d-a529-40fc-981f-483f0c8a9eaf/how_to_get_3d_warehouse_on_sketchup_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ab3ba7-a65e-4854-bef9-8e561c9dfb0b/nisuwadavuzubirijev.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015f6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F6A 5444 bytes
SHA-256: bf70a3ca3f27f278355582512a163461963348fed410410592f65ca69a15b3ac
font_01_sfnt_off000171ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171EE 11072 bytes
SHA-256: f5fc67503da5a286abb58f5f3092ff3d8ba209838a45198d9aee6be24c332db3