Malicious PDF — malware analysis report

Static analysis result for SHA-256 afa80d39affe852d…

MALICIOUS

PDF

81.5 KB Created: 2021-01-10 01:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 77a32ab416def545cacff6870021c16e SHA-1: 1716363ffbd0c02d148dc4d8eaf097e28acf5bd9 SHA-256: afa80d39affe852d62afd2802dcf5b3405d51b7b6485cb1ad39064c2cb6a86b1
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded links pointing to known malicious redirectors and a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. While no scripts were explicitly extracted, the presence of numerous external links suggests an intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ggtraff.ru/123?utm_term=an+inspector+calls+quotes+about+class In PDF document text
    • https://mawakigimewu.weebly.com/uploads/1/3/4/8/134875352/pogudotokek.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371808/normal_5f888f2268c86.pdfIn PDF document text
    • https://site-1176413.mozfiles.com/files/1176413/dogomezaluxipixosekaloz.pdfIn PDF document text
    • https://penukigoguni.weebly.com/uploads/1/3/1/6/131606127/mijez-meruxesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462980/normal_5fba0a8b98928.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385636/normal_5fd0f4b21e66c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451755/normal_5fbc8f2f7572f.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/zumomasugipeno/87699174067.pdfIn PDF document text
    • https://s3.amazonaws.com/zirojopemup/rojatidoferawup.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/wifugalix.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ef43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF43 5184 bytes
SHA-256: 74a6cdd9d8670cbe413f0c0987625c094d406e478026d66de21279a95f20872a
font_01_sfnt_off000100f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100F2 10300 bytes
SHA-256: 54f8c259c22d706ad2382fe4d31fc2447d5fa3ef7f8f15b4a293f74c39c02dd3
font_02_sfnt_off00012434.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12434 16104 bytes
SHA-256: a0e55c347ed5845944b1b45d53e61c164f8ab1c49ee6c0c7a14fb8dbd9a3d746

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