Malicious PDF — malware analysis report

Static analysis result for SHA-256 01cdad6cde3d913b…

MALICIOUS

PDF

72.8 KB Created: 2020-12-27 06:42:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4ffa7f85a8f93f86d84bd86700a9c64d SHA-1: 398460e7de2eac06220310fc904c580ca2e8c49b SHA-256: 01cdad6cde3d913b92a773ff56af246fd813e163821c5641abe5a38ddeacb864
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirector infrastructure, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the presence of numerous links and the PDF structure itself are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cctraff.ru/123?utm_term=the+lost+causes+of+bleak+creek+summary
    • https://lixubirenolona.weebly.com/uploads/1/3/4/6/134669397/gokebawuzozobit_laxamok_xelarevez_jefasare.pdf
    • https://static.s123-cdn-static.com/uploads/4469143/normal_5fc5bdaa46795.pdf
    • https://static.s123-cdn-static.com/uploads/4496402/normal_5fc835416d4da.pdf
    • https://gilibowipasumew.weebly.com/uploads/1/3/4/5/134578686/8785292.pdf
    • https://naxedomabaxa.weebly.com/uploads/1/3/1/6/131606472/noxezulozegu.pdf
    • https://wufikaxom.weebly.com/uploads/1/3/4/8/134883002/4201470.pdf
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5f87522e5ffe9.pdf
    • https://static.s123-cdn-static.com/uploads/4377674/normal_5fe1f75e290cf.pdf
    • https://static.s123-cdn-static.com/uploads/4408186/normal_5fcaf37b5c17b.pdf
    • https://cdn-cms.f-static.net/uploads/4459629/normal_5fb510b6e96f9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/zalisujezajaje/latest_chrome_version_apk.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d411.bin
03eac59a641e88d0048416a0a33e52e2c55d58fd1410c6118d9d69af59b4474e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD411 5104 bytes
font_01_sfnt_off0000e581.bin
4c467a5a152be0d19aa2115dc6e21bd3f31ac7111d92b1125b229fec2a2fa140		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE581 10224 bytes
font_02_sfnt_off00010886.bin
ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 4324 bytes

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