Malicious PDF — malware analysis report

Static analysis result for SHA-256 1315f235aae4c0c2…

MALICIOUS

PDF

73.5 KB Created: 2020-12-17 15:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 19e1346d16e30b9a8b4a67e7bc60b4c8 SHA-1: 9f44e3cb4a17f9f5af5ec5877ad2865032653027 SHA-256: 1315f235aae4c0c291713d0eec1401b1de0b1a01269e6d67ef821905e7f03848
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 identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, appears to be a lure related to medical information, likely to trick users into clicking the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://gettraff.ru/aws?utm_term=atresia+pulmonal+adalah+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4407804/normal_5f939b7ed9511.pdfIn PDF document text
    • https://gigunomivu.weebly.com/uploads/1/3/0/9/130970016/tajugawasipatim_vinizige_resol_setiwigaxejuxo.pdfIn PDF document text
    • https://fibigator.weebly.com/uploads/1/3/4/3/134313363/rumewe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406454/normal_5fd7b1b5df4ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367665/normal_5f8f4b313fb17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389365/normal_5f9745412a689.pdfIn PDF document text
    • https://dutitujazekap.weebly.com/uploads/1/3/0/8/130814390/665612.pdfIn PDF document text
    • https://fonevufaj.weebly.com/uploads/1/3/4/4/134444269/vaziwifolamezake.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9de8934-bde9-4879-a3e4-00b9b2d2b0ab/56859422906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14409ad7-d6fa-4a18-a39a-e3630102e923/wejumozinen.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxenipup/mortal_kombat_android_game_phoneky.pdfIn PDF document text
    • https://s3.amazonaws.com/zebarufuridorur/taxikafozi.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

Related samples 8

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

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE224 5268 bytes
SHA-256: ce0966ea5d61386f2678088df2f27fb6ccdc465203c7d3f976563b4b5e42a368
font_01_sfnt_off0000f3e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E1 11104 bytes
SHA-256: 2d64fb01d69bdea14af67ac3d9ff2c1a5ee4a587ef33fd0af8b2e8df77b70332

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