Malicious PDF — malware analysis report

Static analysis result for SHA-256 79781ea783fde9b7…

MALICIOUS

PDF

60.8 KB Created: 2020-11-25 20:41:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 686adec3b51506a5273227dec3d6b5d5 SHA-1: 90c4a304192e687e907b658c9bea0de60f2f9cb2 SHA-256: 79781ea783fde9b7b8c36a0f167992f4e7731fe213c5a98011efb3e796d969db
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ggtraff.ru'. ML classification and ClamAV also flagged this file as malicious. The embedded URL is likely intended to lure the user to a compromised site for further malicious activity, such as phishing or downloading a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 4

  • 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.
  • 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://ggtraff.ru/strik?utm_term=diners+drive-ins+and+dives+omaha+amato%2527s In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377928/normal_5f8fc42e37161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365525/normal_5f96c3d29c3a2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453891/normal_5fa351bca5fd0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392667/normal_5f8fb27e417ed.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/toliwudalamem/tuxufewamajavukes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3ebe9db2-6dd7-49c5-a2ec-2e3ae6b04a2a/nanban_video_songs_free_download_mp3.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a16b2bec-0f8c-4111-b990-c1cd7b0e592e/82453640838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbcebef-531b-4106-9273-80d2272f48e8/mr_knightowl_albums.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fab6ddf8-7389-448f-89a5-21763b5fa0d4/14659611476.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe0e789-f5fd-4f65-9c33-8559241d5402/h_r_block_key_code_discount.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/80e81e86-c983-44b4-beb0-a92691df795f/51736681731.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/24891a96-2428-4c60-a360-c4414775d70a/44455202795.pdfIn PDF document text
    • https://s3.amazonaws.com/vedexajawo/ihss_timesheet_san_bernardino.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be1cf936-ecbb-4306-b3ed-85f4c0f1b965/79964166902.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_off0000b18d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB18D 5156 bytes
SHA-256: 0d0212ea674b1e226997c0f93ffbb9777cac419ad221a9863e7b7bcae40050af
font_01_sfnt_off0000c306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC306 10572 bytes
SHA-256: b1e6987624c14bb192743b46b817dc38b042ccbde6b62bcee72342c6adcfdd04

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