Malicious PDF — malware analysis report

Static analysis result for SHA-256 8353a3789434e80f…

MALICIOUS

PDF

91.2 KB Created: 2021-05-21 22:48:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc7ef0f3cd957895a7e118dfdaf94d4d SHA-1: 639b537c7e4e5f39c48bf0b47b93c0a5bcf840e0 SHA-256: 8353a3789434e80fc4899fd05941af8cef1bb6d2433b1815ff63ecdc45facb17
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to PDF files hosted on file-sharing services, indicative of a link farm or SEO spamming operation. One prominent URL, 'https://botokaw.ru/strik?utm_term=juego+purble+place+para+jugar+online', suggests a lure related to online games. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9983

Heuristics 5

  • 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
  • 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://botokaw.ru/strik?utm_term=juego+purble+place+para+jugar+online
    • https://xekariwunaju.weebly.com/uploads/1/3/1/0/131070431/9763220.pdf
    • https://static.s123-cdn-static.com/uploads/4376598/normal_5ffca73f4c901.pdf
    • https://cdn-cms.f-static.net/uploads/4422893/normal_601e780f025d2.pdf
    • https://levukuwaxumofet.weebly.com/uploads/1/3/1/3/131383949/4331225.pdf
    • https://cdn-cms.f-static.net/uploads/4380858/normal_602f1ddf7b3db.pdf
    • https://cdn-cms.f-static.net/uploads/4446937/normal_600c390e0345d.pdf
    • https://fogojokiverowur.weebly.com/uploads/1/3/0/9/130969702/burin.pdf
    • https://cdn-cms.f-static.net/uploads/4420930/normal_605077a8ba40f.pdf
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/805760.pdf
    • https://cdn-cms.f-static.net/uploads/4417329/normal_602f48355ae89.pdf
    • https://static.s123-cdn-static.com/uploads/4411682/normal_6002f1d3bdd48.pdf
    • https://nemaxalifaxibox.weebly.com/uploads/1/3/4/6/134627725/nopapifigeru.pdf
    • https://dotadokox.weebly.com/uploads/1/3/4/8/134883209/xewurup_jidufegijopunof.pdf
    • https://cdn-cms.f-static.net/uploads/4452621/normal_5fd1e86c81e97.pdf
    • https://jerefukixuludew.weebly.com/uploads/1/3/4/6/134686450/d623a7070c2.pdf
    • https://womominajarizu.weebly.com/uploads/1/3/5/3/135392323/vizisawozetap-xojoveduju-navetoluda.pdf
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/dalujubezubax.pdf
    • https://benanuvez.weebly.com/uploads/1/3/0/8/130813453/0927df.pdf
    • https://cdn-cms.f-static.net/uploads/4422622/normal_601da59b16fff.pdf
    • https://najuxobetejip.weebly.com/uploads/1/3/4/2/134265875/9303747.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/a284d0bf-222e-4d12-9732-cf7e8719047d/samsung_galaxy_s5_mini_att.pdf
    • https://uploads.strikinglycdn.com/files/47d5583c-fe99-47e4-9bcc-b1499cebf7e8/zojiloxavorire.pdf
    • https://uploads.strikinglycdn.com/files/52a487de-918b-4adb-85da-d4d17e16d9d1/a_handbook_of_critical_approaches_to_literature_fifth_edition.pdf
    • https://uploads.strikinglycdn.com/files/16fc03c0-ffd6-4233-b606-770926ab8ece/is_autocad_software_free.pdf
    • https://uploads.strikinglycdn.com/files/cfa934e4-a5ce-4809-a3e7-9e925cb08a3f/gewizol.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011195.bin
8961ace250c98db63546fd48ae18c458a1fb0f85e889c989062441a8bd077b4c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11195 5128 bytes
font_01_sfnt_off00012316.bin
872018799a247a45f2e1a44524747510961298d7e2597d8a0c61661932ecccc7
pdf-font-stream PDF embedded font (sfnt) at offset 0x12316 2188 bytes
font_02_sfnt_off00012d1e.bin
f9230f189751ec6321858dd89e80a8f20a7e80564e61042b6bdf68feef2c9224
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D1E 13640 bytes
font_03_sfnt_off000156df.bin
74be5bc4d46f64e5c506ae1006f7022dc98ebf960e37c7bf417c2027ca73106d
pdf-font-stream PDF embedded font (sfnt) at offset 0x156DF 1736 bytes