Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5dc02c8d74bdcf7…

MALICIOUS

PDF

64.3 KB Created: 2020-12-23 00:53:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 9d98d71707c8e75a6325bde7facdc048 SHA-1: 1fe2a8a8a4ba7570a04ba84705f3c5e49c9df61f SHA-256: f5dc02c8d74bdcf741c5a50c6ac327d04af045bbc209e209108a866948625ec8
214 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure and an invoice-themed lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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/aws?utm_term=cayman+islands+water+authority+forms PDF link annotation
    • https://mowasedexalobir.weebly.com/uploads/1/3/4/7/134743102/raworun-koretefa-jufebet.pdfIn PDF document text
    • https://lugesivewamaxiz.weebly.com/uploads/1/3/4/5/134596289/1724191.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391921/normal_5fb34b81eb194.pdfIn PDF document text
    • https://rawunixu.weebly.com/uploads/1/3/4/5/134527334/7656284.pdfIn PDF document text
    • https://raketesi.weebly.com/uploads/1/3/4/6/134632322/jedomavuv_xapilol_podegawupumusop.pdfIn PDF document text
    • https://povozunalurowub.weebly.com/uploads/1/3/4/6/134665666/basuw_femoz_misawewetakawix.pdfIn PDF document text
    • https://bewupoterefi.weebly.com/uploads/1/3/1/3/131380107/efe8d7.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/6874006.pdfIn PDF document text
    • https://riwaduzubef.weebly.com/uploads/1/3/4/3/134319835/wajamaz_raroxelexige.pdfIn PDF document text
    • https://mukaxonalox.weebly.com/uploads/1/3/4/5/134580963/4117979.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/c1d30642-ff8f-412d-abc6-9738b25b42a3/formato_hoja_de_vida_en_ingles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbb04ad7-be94-41e4-b2aa-aa30e4283e77/33505237347.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cda2a903-5370-45d4-9aae-95e93886a2c8/wivowifiva.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d033a3d-f353-4346-8915-139b3952c33d/44825126189.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_off0000bd8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD8B 5244 bytes
SHA-256: 0907cddd7fe3001d2b1d8d9a37cdc96f9926161115d6b04a9cb9f2f9cfb89ce9
font_01_sfnt_off0000cf43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF43 11464 bytes
SHA-256: 188dd9f33a3993c7e0dc0155940acb85d4ff4ff72d4b25da7bec5d0497ba64ef