Malicious PDF — malware analysis report

Static analysis result for SHA-256 de498c788388e8ad…

MALICIOUS

PDF

76.5 KB Created: 2021-03-28 22:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 1455b415939609f043783166092fde49 SHA-1: b6e60a74cfb45648bef72c0024467854ee89e98d SHA-256: de498c788388e8adaf9170eb5435924acc4c316e85de3520d9afdcedb1813864
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a lure to malicious sites.

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://botokaw.ru/wix?keyword=wv+hunting+season+2019+2020-21 PDF link annotation
    • http://idealica-official-it.website/zosajuvatitapbjaxa.pdfIn PDF document text
    • http://tameenegypt.com/vanofajekozuyu2wi.pdfIn PDF document text
    • https://xanikijopido.weebly.com/uploads/1/3/4/7/134738407/3235133.pdfIn PDF document text
    • http://mir23.xyz/30390641448rjjuc.pdfIn PDF document text
    • https://lexugorubu.weebly.com/uploads/1/3/0/7/130776619/817b2f21a46e.pdfIn PDF document text
    • http://sevastopol.sale/brussels_belgium_visitor_guide3spfk.pdfIn PDF document text
    • http://save50.pro/which_part_of_canada_is_less_coldfotq5.pdfIn PDF document text
    • https://cdn.sqhk.co/wibononuve/xja5AmV/hocus_pocus_house_whittier.pdfIn PDF document text
    • https://cdn.sqhk.co/jorimalid/eTLiihj/vadoxupaxe.pdfIn PDF document text
    • https://kisagisetiduke.weebly.com/uploads/1/3/4/7/134762251/dujusarima_subonuk.pdfIn PDF document text
    • https://cdn.sqhk.co/venifirub/vmQfhaN/mlp_thorax_and_pharynx.pdfIn PDF document text
    • https://cdn.sqhk.co/lenalibuz/gdwqCgj/bisection_method_examples_with_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/xaduwudixum/bhjauhd/zapumasozeposazixegipidu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5d6c134-df07-4073-abce-5b0c086654d8/13925741021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85aa843b-cd61-4b91-a213-78f625d9552a/50154172545.pdfIn PDF document text
    • https://s3.amazonaws.com/wonumafubij/in_the_bell_jar_meaning.pdfIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_1b92c410de4e4e5f9e77b4b953e7a7c1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/19568c7b-2d86-48b1-825d-fe2fdb07ee97/nalararigukamoziga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1e1868e-4648-48ba-acbf-60c76c19cd77/pamufuxafuko.pdfIn PDF document text
    • https://9169454a-6e45-4b39-89c4-5cd9bf0a6084.filesusr.com/ugd/32fbc8_ad168a364b6e4aabac7fa227eb3c165a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/redegelesibif/casio_hr-150tm_set_tax_rate.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_off0000ed0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED0E 5408 bytes
SHA-256: bcd2dd220c1e95234b20e07dcb075b2d8b50ed4f8dfc5c4675a1264d18118df2
font_01_sfnt_off0000ff94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF94 10908 bytes
SHA-256: f01671baaf178ac06160c7feea9235a0e5de80e87aecbfee50a3c8b00aa4ae74