Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5467067b7f6a56b…

MALICIOUS

PDF

80.8 KB Created: 2020-12-30 02:03:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: f53ae5fcec3b53900b3e8fe801d354d8 SHA-1: 7a5531e64cc79aae6b4874c31ede4e198e00e3c1 SHA-256: c5467067b7f6a56b3f21ac117250bd98ee19f9880d97fb753b7e8423a495b7da
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDFs hosted on link farm domains, suggesting a SEO spam or phishing campaign. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of numerous external links and the PDF structure suggest it's designed to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://traffnew.ru/strik?utm_term=mi+calendario+menstrual+para+descargar PDF link annotation
    • https://nakakikixug.weebly.com/uploads/1/3/4/4/134490848/pagul.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_5fb2b55a7b72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500669/normal_5fea089e80602.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485010/normal_5fdddd04bdc46.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_5fbbd92a5e54a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380213/normal_5f905ffd39d8f.pdfIn PDF document text
    • https://fuvekusegubo.weebly.com/uploads/1/3/4/7/134736786/222110476229630.pdfIn PDF document text
    • https://cdn.sqhk.co/pusobatosip/haLia9p/85757854364.pdfIn PDF document text
    • https://zosibikatojufo.weebly.com/uploads/1/3/4/3/134382834/xibiwe_futorakodunim.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/sutawowirosuvuv/lesser_honeyguide_call.pdfIn PDF document text
    • https://s3.amazonaws.com/felasorarabipis/charleston_county_schools_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxime/68933027210.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_off0000e39a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE39A 5396 bytes
SHA-256: 1a5c62e8c5e4183b209da29431e66db863f9db376ecb1a49d401882a0c1af8a9
font_01_sfnt_off0000f5eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5EB 12352 bytes
SHA-256: 69e4d28554b254d6845e04da07d42726a9488ab1f3ce8def577896da974aebf3
font_02_sfnt_off00011eae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EAE 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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