Malicious PDF — malware analysis report

Static analysis result for SHA-256 a750ec6db3fe1d5b…

MALICIOUS

PDF

74.6 KB Created: 2021-03-18 12:22:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 78225855009b6bc70af6f9dcd4c946ca SHA-1: ecee71388c44e07316127f90f661af5cd62179fe SHA-256: a750ec6db3fe1d5bf055768d4a2815d36b60bb0f83a1bec96cf966238f2ef7f0
206 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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) 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://soxebez.ru/award?keyword=preschool+business+plan+pdf+south+africa PDF link annotation
    • https://cdn.sqhk.co/fowifabibu/gitjbhh/fixadira.pdfIn PDF document text
    • https://sosabugipos.weebly.com/uploads/1/3/4/6/134657522/mozuzunolekugu.pdfIn PDF document text
    • http://bivoxuwod.iblogger.org/19607405933.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501804/normal_5fe29d635c0ce.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445892/normal_5fdebd7ce1677.pdfIn PDF document text
    • http://renuvev.iblogger.org/54716331797.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/bJTXJo4/color_circle_icon_png.pdfIn PDF document text
    • https://cdn.sqhk.co/fezemepusap/djfhewd/65002739970.pdfIn PDF document text
    • https://wopeduvolevim.weebly.com/uploads/1/3/0/7/130776212/fabcb317c.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/hGjfige/twitter_advanced_search_date.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447915/normal_5fe86b159d74a.pdfIn PDF document text
    • http://gidepel.22web.org/hp_deskjet_2546p.pdfIn PDF document text
    • https://cdn.sqhk.co/lagidexetin/6hgWUP9/general_grievous_meme_french.pdfIn PDF document text
    • https://cdn.sqhk.co/wevodapobu/Jiiigsp/67305798336.pdfIn PDF document text
    • https://cdn.sqhk.co/xidujefonari/0hjgdmm/34421019966.pdfIn PDF document text
    • https://cdn.sqhk.co/wagomito/KjcGtx5/vesuviwufe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/donarepemi/1564480240.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/pidog.pdfIn PDF document text
    • http://vawelinixafapi.epizy.com/slimming_world_free_foods_2020.pdfIn PDF document text
    • http://wilafeduzavedew.epizy.com/stihl_gas_trimmer_price.pdfIn PDF document text
    • https://s3.amazonaws.com/kudefem/la_armadura_de_dios_gratis.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_off0000e535.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 5384 bytes
SHA-256: 4623476a47cfa74e343a6058f35c38b0ff69507309f946af957a092e592f827e
font_01_sfnt_off0000f775.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF775 10976 bytes
SHA-256: 2e4dab2a08f9d7e582f24df17e5993694f2eb3f5d0a96a8c722bf832fb10bae6