Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5506d5c235ab5a7…

MALICIOUS

PDF

76.2 KB Created: 2021-04-01 10:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 31ff207ff9f72094a9ab9dcbed12ab1a SHA-1: 59174e55da0830fc85503251124821b76296d41c SHA-256: c5506d5c235ab5a7c10eaab1d0982d3814dd23819695ae03b1c7e4fe7b774293
146 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 6

  • 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 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://lozipotod.ru/strik?utm_term=how+to+name+covalent+compounds+khan+academy PDF link annotation
    • http://fapasevusiledap.mygamesonline.org/phonetics_and_phonology_of_english_language.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408195/normal_5fc8d2e372b5c.pdfIn PDF document text
    • https://bonopabugo.weebly.com/uploads/1/3/4/5/134581776/medovife-wisepuvo.pdfIn PDF document text
    • http://kalidejomepajo.scienceontheweb.net/prevention_of_food_adulteration_rules_1955.pdfIn PDF document text
    • http://gizovivomiz.getenjoyment.net/dutigoxozopifomipozedop.pdfIn PDF document text
    • http://mitimewigupito.mypressonline.com/bixaverixo.pdfIn PDF document text
    • https://jurisosisirebak.weebly.com/uploads/1/3/6/0/136086550/88349c3ee3b112e.pdfIn PDF document text
    • http://sakulog.sportsontheweb.net/plantronics_cs530_instruction_manual.pdfIn PDF document text
    • https://tudevapibor.weebly.com/uploads/1/3/4/8/134884273/wiziwiritid-nukotezaw.pdfIn PDF document text
    • http://vuwimoxit.mygamesonline.org/c7_acknowledgement_form.pdfIn PDF document text
    • https://simebofes.weebly.com/uploads/1/3/1/4/131438459/520316.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366351/normal_60322cad495bf.pdfIn PDF document text
    • http://gomesuzos.mypressonline.com/constructivismo_estrategias_para_aprender_a_aprender.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/gurubafiligo-zetugozanuxuru-butojopiranu.pdfIn PDF document text
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/wiwoju_pafoxodadikuge_rudulo.pdfIn PDF document text
    • http://wivuperafuzo.mypressonline.com/vulvovaginitis_adalah.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5fef16b24e153.pdfIn PDF document text
    • http://ziwigosopijulal.mygamesonline.org/fundamentals_of_power_electronics_erickson_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feniboladesa.rf.gd/fishing_report_captree_ny.pdfIn PDF document text
    • http://pabotojixupi.atwebpages.com/brother_hl-5370dw_wireless_driver.pdfIn PDF document text
    • http://gowejolu.rf.gd/vovemosugewamutezusilo.pdfIn PDF document text
    • http://fukorow.epizy.com/isoniazid_resistant_tb_treatment_guidelines.pdfIn PDF document text
    • http://dufobilubaxa.rf.gd/argos_bed_size_guide.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_off0000ebcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCD 5496 bytes
SHA-256: f03fbec3d7f8338853e6630ceb3eb53a222fda6a63054e22d9626722df2e3cd2
font_01_sfnt_off0000fe78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE78 10604 bytes
SHA-256: 1758f3301bbcb22a03c06414ddee70165231e81a34b1a57de6b52cb713b205fe