Malicious PDF — malware analysis report

Static analysis result for SHA-256 8021d291d87268fe…

MALICIOUS

PDF

70.6 KB Created: 2020-11-25 13:40:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 076f8a2a2850b68f63cddad0ca5f6b1d SHA-1: d24d2761f8bfecb6bd5ed28125c8b0361d559393 SHA-256: 8021d291d87268fec8b4633b33efd21df04f075491b88975d2cf88e9adf41ad3
222 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded links, many pointing to external PDF files, suggesting a link farm for SEO manipulation or to host further malicious content. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords related to 'free download apk', indicating a lure for potentially unwanted or malicious software. The presence of embedded URLs and the ML classifier's high confidence score support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://gettraff.ru/strik?utm_term=pandora+one+free+download+apk In PDF document text
    • https://vixijusodu.weebly.com/uploads/1/3/0/7/130776714/358a7b83b.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/damavi_dopamod_ridugiwup.pdfIn PDF document text
    • https://pekuwomar.weebly.com/uploads/1/3/4/5/134518408/7fba9ae602548c7.pdfIn PDF document text
    • https://vikumeniwexawud.weebly.com/uploads/1/3/0/9/130969440/34beae5db0b367.pdfIn PDF document text
    • https://xorexataziz.weebly.com/uploads/1/3/4/4/134496469/8929800.pdfIn PDF document text
    • https://sekuruzinof.weebly.com/uploads/1/3/4/8/134897543/15abef69ee3dd.pdfIn PDF document text
    • https://jotigafipalat.weebly.com/uploads/1/3/4/8/134896518/0d7bb14fd0edea5.pdfIn PDF document text
    • https://xubuvene.weebly.com/uploads/1/3/1/3/131380433/17906.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/rebomedug/nopuxowekalanuvodu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e737196-e7e5-4588-8728-072d896c4533/kikaweladokirojapepozel.pdfIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/raiders_injury_report_week_8.pdfIn PDF document text
    • https://s3.amazonaws.com/ronenitevodo/ancient_celtic_hairstyles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/81b2309d-1667-4395-acf5-54145dba2094/yin_chiao_san.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/el_cambio_climatico_informacion_para_nios.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_off0000d656.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD656 5016 bytes
SHA-256: 9264d4e09bf8c3637f78e727c7ea77e8e355f8069fefcda5b8ffced30b4d87d8
font_01_sfnt_off0000e78b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE78B 11108 bytes
SHA-256: 1ab4aae1030ea136da7380fd06144e6e03cd36ba6ab71342f2b7900c7e96b015

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