Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ad4e5b040c197ac…

MALICIOUS

PDF

71.4 KB Created: 2021-05-26 15:28:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 348788e66f07a84ae9c012677e9d922f SHA-1: 5d7f2c3e6a2f090dce02f56881e0a7f682aa5b04 SHA-256: 1ad4e5b040c197ac3875bc5a83a34fb516838c64b46e431c9e10ec10b0d0b50b
164 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly-hosted PDFs, suggesting a link farm or redirection mechanism. The presence of a critical heuristic for PDF SEO link farm and ClamAV detection as Pdf.Phishing.Trojan indicates a malicious intent to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains a URL that appears to be a lure for downloading game-related files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • 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
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://kuzutuzo.ru/strik?utm_term=donkey+kong+country+3+apk+android
    • https://ranazujip.weebly.com/uploads/1/3/5/3/135398887/xuvit.pdf
    • https://lurenosofen.weebly.com/uploads/1/3/0/7/130740325/nipoxigemiwizun.pdf
    • https://ledijonag.weebly.com/uploads/1/3/4/6/134689342/vizabidokozoxobis.pdf
    • https://cdn-cms.f-static.net/uploads/4393625/normal_600bde5d6be7a.pdf
    • https://cdn-cms.f-static.net/uploads/4392668/normal_600dbb03e2d0e.pdf
    • https://xisofapetuv.weebly.com/uploads/1/3/4/7/134747578/biduna-vugosunapon-misizegino.pdf
    • https://cdn-cms.f-static.net/uploads/4450624/normal_60151ea25b43f.pdf
    • https://static.s123-cdn-static.com/uploads/4378606/normal_5ff43915207ec.pdf
    • https://cdn-cms.f-static.net/uploads/4372361/normal_5fdc60747ba11.pdf
    • https://cdn-cms.f-static.net/uploads/4405654/normal_604a53a32e96c.pdf
    • https://gazonuzurixe.weebly.com/uploads/1/3/4/4/134485976/9245651.pdf
    • https://degubazof.weebly.com/uploads/1/3/5/3/135304991/sejinazur-kazow-kepatu-solegeli.pdf
    • https://zabapekiji.weebly.com/uploads/1/3/4/4/134470890/29557a3ecf.pdf
    • https://mavuweginu.weebly.com/uploads/1/3/2/6/132681431/8d9a0a.pdf
    • https://cdn-cms.f-static.net/uploads/4369311/normal_5fe7973956747.pdf
    • https://cdn-cms.f-static.net/uploads/4486534/normal_605ff1a2a14f3.pdf
    • https://cdn-cms.f-static.net/uploads/4402960/normal_5fe60b74782ac.pdf
    • https://static.s123-cdn-static.com/uploads/4416932/normal_5fcb9f5be494b.pdf
    • https://cdn-cms.f-static.net/uploads/4368989/normal_60463d2b7a714.pdf
    • https://cdn-cms.f-static.net/uploads/4427086/normal_604d909f7b100.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/e8a8ab99-c94e-4781-89cb-de7ca4b120d9/nafumejexavaxira.pdf
    • https://uploads.strikinglycdn.com/files/f3db7689-cebc-443a-b510-cdda9f40417a/toludabagenenadupaxumewa.pdf
    • https://uploads.strikinglycdn.com/files/ffed4d41-d2b8-4467-99af-6b7e89c33b4e/angularjs_free_book.pdf
    • https://uploads.strikinglycdn.com/files/4b36eb3b-30d1-458a-b44d-a77170ff916a/genolinisel.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_off0000d9ff.bin
59e9523c8b937cfc3026aa999946c8ea2270bd9a0e745e43c58818a005f8d5ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9FF 5360 bytes
font_01_sfnt_off0000ec62.bin
c2ee97ee825d87efd9ba2f4d88b295a5527e85741258355964d61731af416d18
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC62 10588 bytes