Malicious PDF — malware analysis report

Static analysis result for SHA-256 a84d31ca0eb593b3…

MALICIOUS

PDF

72.3 KB Created: 2020-11-19 02:55:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 76f44937c0c06e765e87875e9b9e5092 SHA-1: 91519f22b58ddca445181cfadecd4da07e75fcaa SHA-256: a84d31ca0eb593b3df737d311b3ebb689d3b22ebd94e9a3d20cb0e1955111fa3
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing indicating a malicious redirector link to 'https://ggtraff.ru/123?utm_term=cen-tech+infrared+thermometer+manual+93983'. This, combined with ML and ClamAV detections, strongly suggests a phishing or malware distribution attempt. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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/123?utm_term=cen-tech+infrared+thermometer+manual+93983 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4415946/normal_5fad8230acffc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425910/normal_5fa8e979eaa7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f88097f9a9ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_5f9ae208de207.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454556/normal_5fb5a1a026680.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/wazagidonux/tamilrockers.com_2020_movie_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6816be46-53be-48c6-8bf6-c4fa5d019901/85821959067.pdfIn PDF document text
    • https://s3.amazonaws.com/xanebavifamopez/rutafowagegiwetapise.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/gunblood_western_shootout_unblocked_77.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/teleribawixuzuned.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0fab0d0-c56d-4b24-9a4c-1e0af8f0ec7d/nobebuxarebizijuzererib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/35791750-0ec0-4d4e-ab20-75d6852cd0cd/stone_sour_hydrograd_torrent.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32465084-2387-4e00-aa9a-825cf9bd7cd0/do_penguins_have_sharp_teeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eea9a3c9-e59c-43fb-b97e-8bbef9badc6e/29558772463.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dfcd2bc3-8645-4dcb-aa0e-4f8b6ca128ee/gutefunaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69642828-3df4-44ad-af45-123b8df10859/vuvapaj.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_off0000dbd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBD8 5532 bytes
SHA-256: a3cb358fb5a8e608d3dbe7dbc4abe5c0b0ccd0bc7e731aaf4ddb4285574ec768
font_01_sfnt_off0000ee82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE82 10932 bytes
SHA-256: 1b6b623a74afc75daf86240171c83ce0f401c54a4309c886a8059f7427e16660

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