Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecb296fffdb1f648…

MALICIOUS

PDF

107.8 KB Created: 2021-01-13 15:10:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 7ef0b192876e52c38a4b267c7cd1b9e6 SHA-1: 5d33f5baf781204bd354f54e70e263e4eb0a49fc SHA-256: ecb296fffdb1f648ea32e5d38ec47c3100f327efc5a6530d92bb675db2505f7e
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV also flagged this file as malicious, indicating a phishing or malicious redirection attempt. No scripts were extracted, but the presence of numerous links suggests an attempt to direct users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://traffine.ru/aws?utm_term=chloroform+definition+science In PDF document text
    • https://cdn.sqhk.co/jebumujo/Ebhedjc/97318785338.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373004/normal_5ff3a51c8781e.pdfIn PDF document text
    • https://site-1177365.mozfiles.com/files/1177365/teseem_first_words_for_baby_shower.pdfIn PDF document text
    • https://xefafarorul.weebly.com/uploads/1/3/4/6/134698093/pujog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446923/normal_5fcebfbb5523e.pdfIn PDF document text
    • https://cdn.sqhk.co/dujujema/KfZ1hi6/59246870293.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379846/normal_5ff9f53b50d12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477162/normal_5fbea08470129.pdfIn PDF document text
    • https://site-1173925.mozfiles.com/files/1173925/nobifiji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486565/normal_5ff4fe8255193.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446272/normal_5ff62e385a7cc.pdfIn PDF document text
    • https://site-1247871.mozfiles.com/files/1247871/58928949205.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/wukevirenesu/belajar_grammar_bahasa_jepang.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001457b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1457B 6492 bytes
SHA-256: 0acae127d432746d095b5bd0375a0897f34f14d5dd3edc903598d39ab18e2e5d
font_01_sfnt_off000155af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155AF 4864 bytes
SHA-256: 8549ab5662da2fb221236a042d7e3c4d32d9c3b76758b0d7bcff9f0ddf1e3964
font_02_sfnt_off00016615.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16615 13960 bytes
SHA-256: 65f3a5e123bf0fda45f6495475eb1a3e471d73dd9712c8b6d2a3645f3aaf271f
font_03_sfnt_off0001936d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1936D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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