Malicious PDF — malware analysis report

Static analysis result for SHA-256 65fadb129869c96b…

MALICIOUS

PDF

77.4 KB Created: 2021-01-12 21:42:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3b2e65935cd7a45bbdfc14c323d2e56f SHA-1: ee180016b049b9ea3b6812972e21377e82290283 SHA-256: 65fadb129869c96b65b8687de1f5673b0ac55c95feb022fd096c2d9ce3c90f26
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

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
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://traffset.ru/123?utm_term=shopko+ad+for+this+week PDF link annotation
    • https://site-1168163.mozfiles.com/files/1168163/basic_chemical_composition_of_carbohydrates.pdfIn PDF document text
    • https://site-1217552.mozfiles.com/files/1217552/basic_biochemistry_for_medical_students.pdfIn PDF document text
    • https://site-1178860.mozfiles.com/files/1178860/53771143630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410459/normal_5fb87bf64d9b0.pdfIn PDF document text
    • https://site-1168290.mozfiles.com/files/1168290/dikew.pdfIn PDF document text
    • https://site-1171482.mozfiles.com/files/1171482/advanced_life_support_training.pdfIn PDF document text
    • https://site-1175916.mozfiles.com/files/1175916/36566637821.pdfIn PDF document text
    • https://site-1172627.mozfiles.com/files/1172627/valalumemufanitudokip.pdfIn PDF document text
    • https://site-1174105.mozfiles.com/files/1174105/spelling_test_template_15_words_free_printable.pdfIn PDF document text
    • https://site-1178385.mozfiles.com/files/1178385/31496000276.pdfIn PDF document text
    • https://cdn.sqhk.co/jekefebiba/hFjghgd/vimejarelu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456372/normal_5fa9be4f607eb.pdfIn PDF document text
    • https://site-1179256.mozfiles.com/files/1179256/2344864491.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d479.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD479 6744 bytes
SHA-256: b29f9350a720d2da9dc50567d08c4a82684db1fcb28a47e3a5788345b392d808
font_01_sfnt_off0000e55e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE55E 5356 bytes
SHA-256: 65af149e989a7bcfca047b5630164eda396d412d4e7b9cfbdc91839c947877a3
font_02_sfnt_off0000f79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF79B 2092 bytes
SHA-256: 78e94e2e47178245ca437e301e19f50dc99845ecc02da2ba30fe2b1e34051cc2
font_03_sfnt_off00010140.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10140 11424 bytes
SHA-256: a9808a8dbf3484604ef7a9fd1656fc3feb66ca73e6f2a93b8772724fe9baf9f6

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