Malicious PDF — malware analysis report

Static analysis result for SHA-256 78b333ab6f8eeb65…

MALICIOUS

PDF

113.8 KB Created: 2021-02-13 09:54:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: d9130b3a7de82e43c81d005ec66e22b4 SHA-1: c80274eb581f1ae2c69ee6ac2ed4290cf9dbb7da SHA-256: 78b333ab6f8eeb6519cd48316d296d677c7694975ada144238b1a516b8017dc9
154 Risk Score

Malware Insights

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

The PDF contains embedded links to known malicious redirector infrastructure, specifically 'https://yafferge.ru/123?utm_term=nimble+monkey+king'. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of malicious links within the document suggests an attempt to lure the user to a compromised site, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://yafferge.ru/123?utm_term=nimble+monkey+king In PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/zinokasi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488329/normal_60015be2c57c0.pdfIn PDF document text
    • https://cdn.sqhk.co/mafowixodi/jefjehj/the_unbeatable_game_tricky_brain_game_testing.pdfIn PDF document text
    • https://nivagevap.weebly.com/uploads/1/3/1/4/131438423/kewegov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368991/normal_5feb4a8dbad9b.pdfIn PDF document text
    • https://cdn.sqhk.co/wibezudak/aheEhgh/musotigiboluvuvulono.pdfIn PDF document text
    • https://viradigoposexa.weebly.com/uploads/1/3/4/3/134383508/3825622.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisimak/jOjmjaj/soccer_backflip_penalty_kick_goal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451210/normal_601c980a4008b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370092/normal_6001357312381.pdfIn PDF document text
    • http://bawikivogo.22web.org/barbara_cartland_novel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466366/normal_5ff5c67a8d084.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sowinoto.epizy.com/84167675377.pdfIn PDF document text
    • http://pidawuz.epizy.com/1945588465.pdfIn PDF document text
    • http://fujesotes.epizy.com/guest_book_template_editable.pdfIn PDF document text
    • http://dukazaxotak.epizy.com/37580879729.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001483e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1483E 16980 bytes
SHA-256: 17c107d51c7c1c4ee91b67fb91ec97b135bbcb1d3dbe28c45de007832f0a1706
font_01_sfnt_off00017de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17DE5 4796 bytes
SHA-256: 87b9e7c7c0c657e08389413d2d0bdc3b8d14cf57c8919c871dfd46aa1a399210
font_02_sfnt_off00018e43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E43 14740 bytes
SHA-256: f7a6ec2dd320207b6cc7e2c7e5b3e73f188f67db0fb2fddc86e7b5391886d106

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