Malicious PDF — malware analysis report

Static analysis result for SHA-256 7cb7e2101ca181f9…

MALICIOUS

PDF

77.8 KB Created: 2021-05-20 18:51:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3106ea297d226598af376c10ce30c39a SHA-1: 72e7eaf80d7be0349fb3e400485b6ddd47e413e0 SHA-256: 7cb7e2101ca181f9743ed098e08998d2dd7c6154dca06383fa6edfb050749599
292 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

The PDF contains numerous links to external sites, many hosted on disposable domains, and one specifically points to a known malicious redirector. The presence of a 'download button' lure and instructions for a 'password-protected archive' strongly suggest a phishing or malware distribution attempt. ClamAV detection and ML classification further confirm its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://yafferge.ru/strik?utm_term=hack+para+injustice+gods+among+us+android In PDF document text
    • https://vilofezilo.weebly.com/uploads/1/3/0/7/130740065/92c63.pdfIn PDF document text
    • https://rebazizezasij.weebly.com/uploads/1/3/4/5/134586802/waxirafevufa_nofam_bevulazaxam_vunawomog.pdfIn PDF document text
    • https://xijuxesipokufi.weebly.com/uploads/1/3/4/0/134042605/5813592d7f.pdfIn PDF document text
    • https://risovokoxenixe.weebly.com/uploads/1/3/3/9/133997247/809dda074f.pdfIn PDF document text
    • https://popoxalisasuper.weebly.com/uploads/1/3/0/7/130775362/8784266.pdfIn PDF document text
    • https://gafapelisepofas.weebly.com/uploads/1/3/4/7/134762307/7001038.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410988/normal_6004128c1ed46.pdfIn PDF document text
    • https://garanokuwepo.weebly.com/uploads/1/3/0/8/130874617/sokexalikotizove.pdfIn PDF document text
    • https://viduxetejogat.weebly.com/uploads/1/3/4/6/134600114/xarubuxeniwipopidak.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464311/normal_602f689085178.pdfIn PDF document text
    • https://dunopupusegujuz.weebly.com/uploads/1/3/4/3/134348927/pafug-zurume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_601d86aa3c4af.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/pasawexawinogad/mererafusipemijigizadeven.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5322a25c-3631-4d69-9b2f-07908a09587f/65124689659.pdfIn PDF document text
    • https://s3.amazonaws.com/jojitagifuva/81187920961.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5466e5ea-c087-4a46-be84-a8dee61769ec/89860524521.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed4867ee-ac88-433c-ae55-ee0bcc2a42b7/daxibapurakuni.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7ef1c99a-5488-4a20-a851-30db7988c05c/how_to_light_switch_timers_work.pdfIn PDF document text
    • https://s3.amazonaws.com/gimufesajo/wall_street_journal_cancel_subscription_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031d3dbf-24d6-47fb-b459-60ae23a8fa9d/crown_of_midnight_vk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4589a3b0-42ff-4bcf-b945-e9877a95c98a/duwubonupugit.pdfIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/afterlight_apk_hack.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e9fff1f-5c23-4309-be32-58a9eaf689f0/xekofupelomoje.pdfIn PDF document text
    • https://s3.amazonaws.com/pukiza/70232386169.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5464 bytes
SHA-256: 6d56c9ce420ff7aafdd949e9461fd600e2136a11365ecbdbcc6b1dd5697e2c8c
font_01_sfnt_off0000feff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFF 12316 bytes
SHA-256: f2d314c4aba30feaedd9b24b4d30cbd775bbb729c596332be8a4017894c7bd12