Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a7310295254792…

MALICIOUS

PDF

82.2 KB Created: 2021-02-03 06:45:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0d633e03b1452f4a2664143d167b7be9 SHA-1: ecf2049a974371ef30371b8a3bdeb494f11dd2fb SHA-256: a1a73102952547922a91aa78d0be1f778710bb840507fdbe49c3fb6a6908fbb0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic PDF_SEO_LINK_FARM suggests the document is part of a link farm designed to distribute malicious content. The embedded URL points to 'baarspo.ru', which is likely a phishing or malware distribution site, disguised as a download for 'kika keyboard pro apk'. No scripts were extracted, but the structure and embedded URLs strongly suggest a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://baarspo.ru/123?utm_term=descargar+kika+keyboard+pro+apk PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4485693/normal_5ff2066c41f81.pdfIn PDF document text
    • http://lofarado.iblogger.org/95957978271.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370777/normal_5fcd5dde15491.pdfIn PDF document text
    • https://vovasodakujex.weebly.com/uploads/1/3/0/8/130874601/957864.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391037/normal_5fe59bb293da3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458407/normal_5fed2490a5113.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465930/normal_5ff6c1b180965.pdfIn PDF document text
    • https://nomalepizu.weebly.com/uploads/1/3/1/3/131398516/piferu.pdfIn PDF document text
    • https://jifilebipik.weebly.com/uploads/1/3/4/3/134375607/sonoluluxaf.pdfIn PDF document text
    • http://niluxedofodip.22web.org/xurelotidepolabil.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.opentle.orgIn PDF document text
    • http://novezepif.rf.gd/7621496005.pdfIn PDF document text
    • http://dinoxisajuz.rf.gd/buddenbrooks_deutsch.pdfIn PDF document text
    • https://s3.amazonaws.com/pibajuwi/chetek_wi_fishing_reports.pdfIn PDF document text
    • http://tozoxuzev.epizy.com/minecraft_bedwars_game.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
    • http://www.gnu.org/licenses/gpl.htmlIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e890.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE890 5516 bytes
SHA-256: 43d058ece5aee12139cfe28cac85ff54e5fc20f5f2d019a0d5382e2311062ccc
font_01_sfnt_off0000fb63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB63 10740 bytes
SHA-256: 96728181e1aec6a1f12dc91c7913076dcb1264c6cf43803ef02f770f72854f9b
font_02_sfnt_off000119b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119B0 9800 bytes
SHA-256: 7ff1381f63262f9a304b950056286c0383aef804d2d1d2cd9caa1926adf1c2f1

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