Malicious PDF — malware analysis report

Static analysis result for SHA-256 33b076d762f35577…

MALICIOUS

PDF

79.6 KB Created: 2021-04-03 02:13:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 19deb4160dcb15700307be89051f0834 SHA-1: e0d9cd491a3e797aa45a22c9818477274e0f1214 SHA-256: 33b076d762f35577b2b779f6e5a6148dea0747c45d566e9a347a2dc9f30298d3
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm designed to distribute malicious content or facilitate phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to a watering hole or phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://midufefew.ru/award?keyword=medicaid+abn+form+2020+pdf PDF link annotation
    • https://cdn.sqhk.co/doxinotilid/gfvjeI8/golang_html_template_parse_files.pdfIn PDF document text
    • https://cdn.sqhk.co/barosevarega/Gheiigd/railway_qr_code_last_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386361/normal_5fe569ea7ee2e.pdfIn PDF document text
    • https://tajagarajoj.weebly.com/uploads/1/3/0/7/130776182/lepumi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449615/normal_5feb88b5da8c8.pdfIn PDF document text
    • https://saletenabij.weebly.com/uploads/1/3/4/3/134339554/liwemepejutaje.pdfIn PDF document text
    • https://cdn.sqhk.co/gixekoji/4TarDji/35395566303.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474752/normal_60532947d809d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370528/normal_6039122204d42.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/GWEUthi/bekedekomu.pdfIn PDF document text
    • https://newimogo.weebly.com/uploads/1/3/1/0/131070302/7924067.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379723/normal_5fdff6a14808a.pdfIn PDF document text
    • https://cdn.sqhk.co/toxinize/heU5Fhi/69368330814.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475728/normal_5fdedd2a7eb5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425921/normal_5fd7cb4139c1d.pdfIn PDF document text
    • https://nivavige.weebly.com/uploads/1/3/0/7/130739715/6154931.pdfIn PDF document text
    • https://serawododi.weebly.com/uploads/1/3/4/8/134885696/14d2c69cd0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367644/normal_5fd909741bc11.pdfIn PDF document text
    • https://jusopusoguwukul.weebly.com/uploads/1/3/4/4/134494455/1f09decbb2b23c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://3902ed59-0476-43e7-b966-b2171fba8c87.filesusr.com/ugd/12dc78_35e64b49a1c54823bc6f0862691c25a8.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_d8fb1659057d417f9fcd6f813cd20361.pdf?index=trueIn 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_off0000f7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F6 5512 bytes
SHA-256: ea21786f42c456a3f361e7d4519ee03f805411f39a6ec92339a1c0cf245f6e42
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 11356 bytes
SHA-256: b1b19b17508e1b5ab2fdb359a2fe4fed52544c3fb1cfad81650f4edb71e1a8ce