Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb5d3b11b7587005…

MALICIOUS

PDF

78.4 KB Created: 2021-04-02 08:26:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 221c858cb7cbd6f65ca1537e5456c5ba SHA-1: 7f6be95593eb541412d3edc38abbfa9584bc3232 SHA-256: cb5d3b11b7587005872b19d958793c95fbd9bfd24845e2942a49808bc8497af9
206 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. 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 0.9992

Heuristics 7

  • 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) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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://leonvi.ru/wix?keyword=rival+griddle+manual PDF link annotation
    • http://sanelobazigi.medianewsonline.com/aviones_de_papel_para_armar.pdfIn PDF document text
    • https://miduginoxem.weebly.com/uploads/1/3/4/8/134892771/6882280.pdfIn PDF document text
    • http://voyazh-shina.com/domuvcs87g.pdfIn PDF document text
    • https://nipodixosun.weebly.com/uploads/1/3/4/4/134494364/2462671.pdfIn PDF document text
    • https://liketoxisok.weebly.com/uploads/1/3/0/7/130739237/tadinemotexil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386354/normal_602090c5cf298.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459164/normal_5fd6eb1964d33.pdfIn PDF document text
    • https://sudivepa.weebly.com/uploads/1/3/5/3/135315425/busapujukevu.pdfIn PDF document text
    • https://mejefarekobuk.weebly.com/uploads/1/3/4/3/134338461/993481.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421366/normal_6063fbb669013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388815/normal_604424da1b579.pdfIn PDF document text
    • https://kufojomarolov.weebly.com/uploads/1/3/4/4/134401526/3592050.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420589/normal_60008d06dd12c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470961/normal_6022173f57111.pdfIn PDF document text
    • http://vsspb.ru/956569398239gndk.pdfIn PDF document text
    • https://moxudoged.weebly.com/uploads/1/3/3/9/133999753/kebubuvetuxaxi_dixebapi.pdfIn PDF document text
    • http://xuwuvewisin.mypressonline.com/amagama_okuhlabelela_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446260/normal_60023614b06ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417138/normal_6041f6d28b610.pdfIn PDF document text
    • http://fruits-summer.fun/butepajimolaliwusupakil183w.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405409/normal_5fd122844e95c.pdfIn PDF document text
    • http://womans30planet.com/nadirigiwirugidadi0oujk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374371/normal_6021d2f1374a4.pdfIn PDF document text
    • https://xadiditenir.weebly.com/uploads/1/3/4/7/134763486/rupuw.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wutesejib.onlinewebshop.net/fokepixebofelawozibales.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_off0000f56f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56F 5032 bytes
SHA-256: c98b0eb9dc244c95c5b5a7ca8c144401c90caa89ce7b50259c81c45e069cbf9d
font_01_sfnt_off00010682.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10682 11104 bytes
SHA-256: 39bf546e663ca5014dd9c916bd255876d550157040f9927e5c7bacc00cb0430a