Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b173699c8752ce8…

MALICIOUS

PDF

77.2 KB Created: 2021-03-17 03:27:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fec7d0ae6a6a32a80337b60d454f6a1e SHA-1: b54a971f35ce377798bdaedf4d05e47dce5b41bb SHA-256: 2b173699c8752ce88a99b45cbef0d70ecb48809125a4eb07fcc12331f004da6c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to lure users to malicious content.

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://soxebez.ru/wix?keyword=50+success+classics+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376375/normal_60207ebcdcf53.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496015/normal_601831220a98f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496389/normal_602570f5e93ec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487381/normal_601f29451e28f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469860/normal_5fc95b2716338.pdfIn PDF document text
    • http://voxamuzovo.22web.org/animated_tiger_wallpaper.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426416/normal_5fe787fa8a990.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/51567805437.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/2011_bmw_s1000rr_performance_specs.pdfIn PDF document text
    • http://lizagubiluxape.rf.gd/zatajasuliketejanofabagoz.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_6e6840503d5d44db80d90a422f227f00.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/bubble_shooter_saga_2.pdfIn PDF document text
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_50987fe8287049758877c0a6d52408a8.pdf?index=trueIn PDF document text
    • http://vopuxoke.epizy.com/45975343628.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/spotify_mod_pc_terbaru.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_c6b5b157ea7747a18646cf2ed3a700ec.pdf?index=trueIn PDF document text
    • http://molijogur.epizy.com/davone.pdfIn PDF document text
    • https://5e9c932d-19a8-4d5a-a970-d4bc0bcb832b.filesusr.com/ugd/bae0a0_53b27bd56b604443828c3a814e8ff5c7.pdf?index=trueIn PDF document text
    • https://91c7bc9f-df77-4dbd-ae51-8bcf521f3e61.filesusr.com/ugd/1df9ea_2315bbcf956b401a85cb9926931faa45.pdf?index=trueIn PDF document text
    • https://69669160-cc20-42a3-bfef-e1e1fd1f8163.filesusr.com/ugd/8094a4_9dd6bb063cf946f29c0d696f7b2c92a9.pdf?index=trueIn PDF document text
    • https://07a970a6-a864-461d-ba0c-8deda34efc75.filesusr.com/ugd/b56c0d_7dfd8cea12ea48598d6981580f863c3e.pdf?index=trueIn PDF document text
    • https://a8a57b57-a5e9-4b5c-b824-02731ce3a1bd.filesusr.com/ugd/cfa667_266fe5214e9d459eae44246c0fef3127.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f06e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF06E 5224 bytes
SHA-256: 591ae0cf57d5499086f4e4ad893ec81b176467708711f7592ea53da81e2ddc31
font_01_sfnt_off0001024e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024E 10996 bytes
SHA-256: 979b28e03a7777e21de80e71ecfc593a4b330da389113f18ab06ab9aa5b379c0