Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef5aef4d2c891cd2…

MALICIOUS

PDF

75.5 KB Created: 2021-02-11 13:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 97574521880b608b6b9d2eda3914eda1 SHA-1: 2bb0edf7e4bda9869abb9c862605158a89763689 SHA-256: ef5aef4d2c891cd2312d21a7eaf1db9d06cecf1d556bdc24045ec139c13e3d95
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and numerous external URLs point towards a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/123?utm_term=philips+magnavox+pm435s+manual PDF link annotation
    • https://vujebitaj.weebly.com/uploads/1/3/4/7/134759162/razurikamoxegedamebo.pdfIn PDF document text
    • http://bilabugova.iblogger.org/vad_betyder_emojisarna_p_android.pdfIn PDF document text
    • https://bewizujire.weebly.com/uploads/1/3/2/3/132303264/afb585eb09b30e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369503/normal_6013637e9d141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427085/normal_600aabc887952.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466398/normal_5ff80830f1059.pdfIn PDF document text
    • https://xoxomedeze.weebly.com/uploads/1/3/5/3/135308121/454a19ac4f4.pdfIn PDF document text
    • https://bojubuloxobepi.weebly.com/uploads/1/3/0/9/130969884/zomakazopidatinodozo.pdfIn PDF document text
    • https://sekilulijafos.weebly.com/uploads/1/3/1/4/131438177/gipexa.pdfIn PDF document text
    • http://ruseseru.iblogger.org/49942598636.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475571/normal_5ffe0cfba7eed.pdfIn PDF document text
    • https://kewidavarij.weebly.com/uploads/1/3/4/6/134696647/tumugomekutela.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/waxegatulo/zewogaxipawufilibameta.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/46871951836.pdfIn PDF document text
    • https://s3.amazonaws.com/baxekojojexusol/33909334922.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e5f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F1 5644 bytes
SHA-256: fda06d22a72fdf0bab46466f54504989e7746a0058a642c47fa3e10b01b4ed60
font_01_sfnt_off0000f921.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF921 11808 bytes
SHA-256: 2ad08821f5b4e11943c8656b101062a6c020def7309edd0513825d315ee76579