Malicious PDF — malware analysis report

Static analysis result for SHA-256 09c4c2d822325d12…

MALICIOUS

PDF

80.3 KB Created: 2021-06-02 21:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 949a920df4007e67213d349f5cdfdcf5 SHA-1: 69f2e0a2774d360165f6a4108e344db81717ab9f SHA-256: 09c4c2d822325d1278f3aab13ec142193db2e5507bfdec0f90503f8f3b572efd
96 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 pointing to PDF files hosted on file-sharing services, suggesting a link farm or SEO poisoning tactic. One of the embedded URLs, 'https://archism.ru/pbw?utm_term=vidmate+app+apk+free+download+latest+version', is directly associated with the document's apparent lure of software downloads. While no scripts were explicitly extracted, the PDF structure and the high ML classifier score indicate malicious intent, likely related to redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 4

  • 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.
  • 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://archism.ru/pbw?utm_term=vidmate+app+apk+free+download+latest+version
    • https://tezonebikinigax.weebly.com/uploads/1/3/1/6/131637870/fekijevokomekebura.pdf
    • https://jizexukufi.weebly.com/uploads/1/3/4/1/134109318/vukodetaresuma.pdf
    • https://static.s123-cdn-static-d.com/uploads/4467979/normal_60b2eb1f2ca43.pdf
    • https://zetakopazo.weebly.com/uploads/1/3/5/3/135351561/998153.pdf
    • https://fumuzajel.weebly.com/uploads/1/3/4/5/134588097/a8ff94ecc2c25.pdf
    • https://gerozelijoxujib.weebly.com/uploads/1/3/4/4/134476991/3262994.pdf
    • https://jufesuzukexo.weebly.com/uploads/1/3/5/2/135294717/guvudorukifawebonaz.pdf
    • https://kuvakikarubefi.weebly.com/uploads/1/3/1/3/131383404/zafejevu_wowapefoxi_sujolavowoxo.pdf
    • https://cdn-cms.f-static.net/uploads/4451940/normal_601934ca39a7b.pdf
    • https://nubesojobe.weebly.com/uploads/1/3/1/3/131398221/lupaveganov.pdf
    • https://cdn-cms.f-static.net/uploads/4368740/normal_603c7640aef32.pdf
    • https://cdn-cms.f-static.net/uploads/4383444/normal_60329cc6ac840.pdf
    • https://sumikoxivabozo.weebly.com/uploads/1/3/3/9/133997645/pazema.pdf
    • https://fojumujitugesi.weebly.com/uploads/1/3/4/6/134688065/9e54a2.pdf
    • https://fizinizaboz.weebly.com/uploads/1/3/5/3/135304720/kunumu.pdf
    • https://static.s123-cdn-static.com/uploads/4459329/normal_5fc68ec47b06b.pdf
    • https://punotajevi.weebly.com/uploads/1/3/4/2/134266109/7d3382db34.pdf
    • https://cdn-cms.f-static.net/uploads/4403143/normal_602d3d4fc0556.pdf
    • https://cdn-cms.f-static.net/uploads/4373527/normal_600c66062b2f2.pdf
    • https://lapefobok.weebly.com/uploads/1/3/4/6/134663543/lenifuj.pdf
    • https://vulabomanuxuw.weebly.com/uploads/1/3/4/8/134857085/8713261.pdf
    • https://gedarimetesuja.weebly.com/uploads/1/3/1/3/131398281/xigojafakotubo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/fd39ea38-0177-4791-a658-257245837454/how_do_i_connect_my_speaker_to_my_laptop.pdf
    • https://uploads.strikinglycdn.com/files/951307ca-af3e-44f0-be73-31a2fff51aac/modo_de_produccion_feudal_en_mexico.pdf
    • 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_off0000fd52.bin
acd41776a4be618a93a5aa460e71c262ba900068b477dcabbd89c60fe8b1816a
pdf-font-stream PDF embedded font (sfnt) at offset 0xFD52 5368 bytes
font_01_sfnt_off00010f9d.bin
e58135604b8b5033dca2ae1470c7048bba45f7c2efb1912de3de09db0a08b60a
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F9D 10440 bytes