Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e4a4c19805986e…

MALICIOUS

PDF

82.3 KB Created: 2021-01-16 10:58:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 4a00dbcb6bbcef42ce1e3653455cf274 SHA-1: 85e925eb3ab2e60d55022de5a79039e6ca8eec78 SHA-256: 38e4a4c19805986e19523c079164386c5b4daffe25781899bd8c1af12fa3f37b
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external links, many hosted on disposable domains, presented under the guise of a 'student management system' template. This suggests a phishing or credential harvesting attempt, or a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=student+management+system+html+template+free PDF link annotation
    • https://site-1173352.mozfiles.com/files/1173352/56695303202.pdfIn PDF document text
    • https://site-1171827.mozfiles.com/files/1171827/didi_food_delivery_australia.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369518/normal_5feb9ae029e82.pdfIn PDF document text
    • https://site-1166652.mozfiles.com/files/1166652/daily_expense_excel_sheet_for_restaurant.pdfIn PDF document text
    • https://fokomowopijav.weebly.com/uploads/1/3/4/6/134643156/rexelelematoko.pdfIn PDF document text
    • https://galuxenezinex.weebly.com/uploads/1/3/4/4/134437763/5236416.pdfIn PDF document text
    • https://site-1197344.mozfiles.com/files/1197344/zasumilatotizun.pdfIn PDF document text
    • https://site-1168140.mozfiles.com/files/1168140/asphalt_8_airborne_android_credits_hack.pdfIn PDF document text
    • https://dodevapamoj.weebly.com/uploads/1/3/4/3/134352329/1235043.pdfIn PDF document text
    • https://site-1174289.mozfiles.com/files/1174289/51733418205.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/libowebujakux/66316742865.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_off00010604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10604 5660 bytes
SHA-256: 25b576dc8e2c852ef9e2a224f7a7b3809e39bddac88a736dfc672e244103c5bb
font_01_sfnt_off00011925.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11925 10372 bytes
SHA-256: 609434efc46a4b7cedccf29561297a791a570b51dafa88e8198c86dae6376ba3

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