Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4071b0f4f0003ab…

MALICIOUS

PDF

61.6 KB Created: 2020-11-13 01:22:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 3cef740671a9aa39b2b3abfe08e9cf5d SHA-1: ee9ccd87f1b699fd32c2bff749d54c81b7deb1bb SHA-256: d4071b0f4f0003ab55112d676e21661f1b2dc986375cb2e1a0fe6d3c2caf246f
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one critical heuristic identifying a link to known malicious redirector infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of numerous links suggests an attempt to lure the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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://traffmen.ru/123?utm_term=sonic+after+the+sequel+dx+download+pc In PDF document text
    • https://kafigibedup.weebly.com/uploads/1/3/4/4/134479504/kavukunumeguvo_sanobapuvo_lonamizoxekejik_vidazegevaxik.pdfIn PDF document text
    • https://bipikive.weebly.com/uploads/1/3/4/3/134342269/733132ab2dd47.pdfIn PDF document text
    • https://bapepewemeg.weebly.com/uploads/1/3/4/7/134702997/pesaronotodowo.pdfIn PDF document text
    • https://dubutabinagi.weebly.com/uploads/1/3/4/4/134441981/nesupimimazo.pdfIn PDF document text
    • https://wazajodowefode.weebly.com/uploads/1/3/4/0/134017502/bde8f8ab47.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/ditetapewexodofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/28009334580.pdfIn PDF document text
    • https://s3.amazonaws.com/fefurorobumi/afcat_1_2017_question_paper.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d4336ed-9c81-4ee2-bd6d-4909fb723809/el_witcher_3_kaer_morhen_como_llegar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebdd4590-d5d9-4cd9-80aa-45aee321c672/jakanaritudiduk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b5b61f74-9151-4807-b319-c869c4ce7574/18782409620.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/christianity_and_african_culture.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e06e46d-15eb-4631-87a1-c4d0a53d3de7/john_wick_mp4_download_in_hindi.pdfIn PDF document text
    • https://s3.amazonaws.com/susopuzupure/bavapub.pdfIn PDF document text
    • https://s3.amazonaws.com/xopugup/vusijudajudivogukik.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b34c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB34C 5632 bytes
SHA-256: 24cd48f027f21e4b457494a83f9f3a20e85fcc18e0c750818f53fe817b4f8045
font_01_sfnt_off0000c694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC694 10172 bytes
SHA-256: fbd8308658a4520a5aa0ac6f96762a674cd8cc14bad9ad587ec051f6e35f1b4e

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