Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3709445932846ba…

MALICIOUS

PDF

78.9 KB Created: 2021-04-23 16:45:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: b7745f541cebc56284598bea618e676d SHA-1: 2ea3a89fa39136f434bae5cc10725b1dfd933213 SHA-256: b3709445932846ba101f5a391820cd20feac2e45cfe8f45d6003ca39ab3fb82d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing indicating redirection to known malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lure the user to malicious sites, likely for phishing or to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/strik?utm_term=what+is+the+frequency+response+%2528microphone%2529+of+the+hd+4.50btnc+headset In PDF document text
    • https://lofefogurabu.weebly.com/uploads/1/3/1/1/131164054/kovejukumon.pdfIn PDF document text
    • https://selokifasafu.weebly.com/uploads/1/3/4/3/134383977/nawekosafajeta_lidozilemaxat_rexus.pdfIn PDF document text
    • http://walolexokesufa.sportsontheweb.net/konflik_antar_agama_di_indonesia.pdfIn PDF document text
    • http://instapriz24.online/165268829829kd5x.pdfIn PDF document text
    • http://allostar.buzz/how_to_connect_jabra_talk_55_to_laptopx02fb.pdfIn PDF document text
    • http://agentsoft.space/92897948181vtso8.pdfIn PDF document text
    • http://zolijava.iblogger.org/microsoft_outlook_2020_calendar_tutorial.pdfIn PDF document text
    • https://sunajekivogemaz.weebly.com/uploads/1/3/4/8/134895881/5707763.pdfIn PDF document text
    • https://luxituwane.weebly.com/uploads/1/3/1/8/131859527/4cd896d45a.pdfIn PDF document text
    • http://zijozarub.mygamesonline.org/29465691184.pdfIn PDF document text
    • https://loputoporebile.weebly.com/uploads/1/3/4/8/134847610/xotarowedufusob-jugamozav-juvukinuvodib.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/c6b36420-1f19-4a5d-bbcd-f95f5850ffb6/selago.pdfIn PDF document text
    • http://nataxos.epizy.com/wifi_authentication_problem_in_android_phones.pdfIn PDF document text
    • http://retelikejajego.rf.gd/17154456041.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8aed18d8-17ab-4a76-bd3a-39e5885e5374/cuales_son_los_sintomas_de_cancer_de_vejiga.pdfIn PDF document text
    • http://xisapedugifado.epizy.com/zabomizoxipizet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4fa3f44-47e1-4b04-ac9c-2c6cb1462f61/62097052572.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/181d2f84-1653-43f2-bb03-9bd5df98f4ad/59575508045.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/963abd9d-8542-4188-9a08-1df3cdb2966e/colorado_cheapest_computer_repair_durango.pdfIn PDF document text
    • http://pizodixevefok.rf.gd/multinational_advertising_noun.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_off0000efd5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD5 6284 bytes
SHA-256: 33b4d33a688d3cdee08f413cfb6e63b8367ce8882c4878321e2f66ea4fa76f18
font_01_sfnt_off0001053d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1053D 11112 bytes
SHA-256: 0f91efe5292274f9804e90ab28a1b10a43222414d22aec1da6484322d027297f

Open this report in the interactive analyzer, or submit your own file for analysis.