Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc58357576865b22…

MALICIOUS

PDF

83.2 KB Created: 2021-02-28 08:51:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 0dba697da1bbb49cf9d40d2e083fa685 SHA-1: 76e4cc505dc0756018a033113e03ab85a0d6384e SHA-256: cc58357576865b2225f7ca0f21801b9b96215f927546736d8f70dd8d9e2b7093
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as 'Pdf.Phishing.Trojan' and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, with at least one redirecting to a suspicious domain ('jacksth.ru') disguised as a forex trading strategy PDF. The presence of multiple disposable hosting links further supports a phishing or malware distribution scheme.

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 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://jacksth.ru/strik?utm_term=simple+forex+trading+strategies+pdf PDF link annotation
    • http://lozhobelir.space/duravopuzinarubegemikuzum1ag.pdfIn PDF document text
    • http://kixurox.getenjoyment.net/26991281289.pdfIn PDF document text
    • https://nakotugobal.weebly.com/uploads/1/3/5/3/135300729/pafemolarojove.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481280/normal_6031414ec16ec.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/rinnai_heaters_home_depot.pdfIn PDF document text
    • http://pojapusevipuzu.mypressonline.com/voxemalozoxoxitiweto.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461485/normal_602901bba0ed1.pdfIn PDF document text
    • http://keysecret.ru/plc_allen_bradley_micrologix_1400_manualfywtu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_60322231a0007.pdfIn PDF document text
    • https://witowufagefalob.weebly.com/uploads/1/3/0/7/130738848/63ef8d4.pdfIn PDF document text
    • http://betmoy56.com/akkurat_mono_fontgaxl5.pdfIn PDF document text
    • https://siwuxamafovad.weebly.com/uploads/1/3/4/4/134489720/3a624716f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://felawikemuda.epizy.com/34103047183.pdfIn PDF document text
    • https://s3.amazonaws.com/sewamos/dijeseposuvikedixofebexak.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_off0000f30e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF30E 5532 bytes
SHA-256: c5d4bff7954affd37dc467025b0868e6cd8ce9ad8ba514023d71793f4ef79961
font_01_sfnt_off000105d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105D1 10768 bytes
SHA-256: 573e10f08023df19d764fed4397e54b74e6de38b238e835c523a56c7e32c584b
font_02_sfnt_off00012af3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF3 16028 bytes
SHA-256: 8345d1cc2b6b461b856d0454e2cf67edf5851291b6d0ebf21a7da0c9813a2b7f

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