Malicious PDF — malware analysis report

Static analysis result for SHA-256 a90ea2669ba19e2b…

MALICIOUS

PDF

73.6 KB Created: 2021-05-20 00:50:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: eabf687179f3fe8d0dc970b063a2c648 SHA-1: e28b6ca999a2aec4c68c19cfa8895737859c26d7 SHA-256: a90ea2669ba19e2b64f03c66cb07ed4daf0b4637a343e3243e3ad148c5ad0090
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 various platforms, suggesting a link farm or redirection mechanism. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The embedded URLs likely serve as lures to malicious sites or further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://resalured.ru/strik?utm_term=database+systems+design+implementation+and+management+solutions+manual+pdf PDF link annotation
    • https://koxamuru.weebly.com/uploads/1/3/4/8/134890845/7667111.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445531/normal_5ffecf4fb1230.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463538/normal_600165678bf72.pdfIn PDF document text
    • https://suniponemiviku.weebly.com/uploads/1/3/1/6/131636748/guzerakid-wevoxuwodok-desitewev-sanagisixikul.pdfIn PDF document text
    • https://viwajojavejad.weebly.com/uploads/1/3/1/8/131858172/54334.pdfIn PDF document text
    • https://fonixokud.weebly.com/uploads/1/3/5/4/135400654/xutulakizakuv_zefesakiwosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369926/normal_5ff75df448ee7.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/d18f7f03-6f26-4ded-be14-797236eaa332/tusitafimetomisotuwuraxov.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f3211368-0bd1-4684-a21c-d493694ade4d/book_review_template_high_school.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc7203e8-1218-4fa6-96ed-92c424741386/36862433073.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a558d6fb-b8c4-42e9-9504-ec4fde50742f/bow_tie_medical_broadview_heights_ohio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c9368fb-7ec5-4e16-9ac5-faedb3644508/68270932215.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/amelia_bedelia_books_age_level.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb0120b7-1733-4386-a24e-8c438535d358/dr_seuss_horton_hears_a_who_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89e528f2-f532-44cd-9d66-4dce84f19628/aspiracin_de_secreciones_orofaringea.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1408b647-1880-46ba-855c-d7f1e88c6fbc/how_to_unlock_a_verizon_lg_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/670f7d85-22a4-4789-8fd4-dc7f58bd9b10/boxaxuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/656fe716-abab-4e35-95c6-b64eda6c78a5/noroxisimopugikevu.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/rejezezerubogi.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_off0000e02b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE02B 5508 bytes
SHA-256: 7b64a0f8cd5cf3f30698cbbc833831942e9945259f8d4bbea9a418a5e32632cc
font_01_sfnt_off0000f2e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2E2 11204 bytes
SHA-256: 3a48901ff42c154e1ed174ed45093afc291e131a2358513263122b7ce2f8eab6

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