Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79c8b4e809aac21…

MALICIOUS

PDF

75.8 KB Created: 2021-01-18 19:15:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 63234f5e9a3635568e6bd6b825399398 SHA-1: ee86e4d89d6289d6232316dd4eb2eee962a46a20 SHA-256: d79c8b4e809aac21f8a29fbed88cc3701f7e6aa56a918d7f833a688f79c35b6a
186 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with numerous URLs pointing to disposable hosting services, indicating a likely phishing or SEO spam campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as Pdf.Phishing.Trojan. No scripts were extracted, but the presence of embedded URLs and the link farm structure are indicative of a phishing attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://traffset.ru/123?utm_term=albion+online+review+2020 PDF link annotation
    • https://gakosokilexavum.weebly.com/uploads/1/3/2/6/132695298/wejijerafeput.pdfIn PDF document text
    • https://riregibo.weebly.com/uploads/1/3/4/7/134771695/vunizavexug_kipokamofimafil_xafawoz_powotol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_5f8c8f223695e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404733/normal_5f9d2653b6c42.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421051/normal_5ff4d1dac5546.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378410/normal_5f8c12660f12a.pdfIn PDF document text
    • http://vosalax.22web.org/ankara_styles_2019.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409819/normal_5fb84a309dae1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413977/normal_5ffd01b33d9e4.pdfIn PDF document text
    • https://lajexupizad.weebly.com/uploads/1/3/0/7/130775806/texudunite.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487618/normal_5fae96db73d12.pdfIn PDF document text
    • https://xororawezajeber.weebly.com/uploads/1/3/5/3/135338150/pupedezoxew.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366354/normal_5f9e6f638d3ae.pdfIn PDF document text
    • http://gonugotez.22web.org/tv_guide_itv3.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/gajabedafot/formal_definition_of_artwork.pdfIn PDF document text
    • http://jasukapikubov.rf.gd/84686755539.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/55559957550.pdfIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/luzixogawureleneponowug.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_off0000ed15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED15 4844 bytes
SHA-256: bfe4b29401557e9acc4006fa7d04d1e092ec2c4cc793cd050f58f1ecb3bc3b9f
font_01_sfnt_off0000fdb7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB7 10688 bytes
SHA-256: 85838f95b373717e14094fdc3688ab7e8c7867e42381ff547eb531222e4ad7c0

Open this report in the interactive analyzer, or submit your own file for analysis.