Malicious PDF — malware analysis report

Static analysis result for SHA-256 284f9f57209f804d…

MALICIOUS

PDF

76.0 KB Created: 2021-01-09 20:04:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 1f3b5bbf98648c7ebf71af24ebe08eae SHA-1: 872607b76d9c5e6fbc11849385687780125bcfba SHA-256: 284f9f57209f804d6ff24af89ca3d94bfb0e9917416954bc55724e0cdf1ea981
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically indicating it is a redirector to malicious infrastructure. The embedded URLs, such as 'https://ggtraff.ru/123?utm_term=yoga+for+cerebral+palsy', are indicative of phishing or malware distribution attempts. The document body is heavily obfuscated and contains what appears to be junk data, further supporting a malicious intent rather than legitimate content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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.
  • 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=yoga+for+cerebral+palsy In PDF document text
    • https://site-1168018.mozfiles.com/files/1168018/99304308047.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388181/normal_5fad90e2b8f7b.pdfIn PDF document text
    • https://site-1180216.mozfiles.com/files/1180216/24040194344.pdfIn PDF document text
    • https://site-1167971.mozfiles.com/files/1167971/venn_diagram_worksheet_math.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379046/normal_5fd1156ec15d1.pdfIn PDF document text
    • https://dubakaxejevam.weebly.com/uploads/1/3/2/6/132696109/kevorijisixojup.pdfIn PDF document text
    • https://fagutefoxod.weebly.com/uploads/1/3/4/2/134235025/8538419.pdfIn PDF document text
    • https://site-1084247.mozfiles.com/files/1084247/depujefobabakutozuvow.pdfIn PDF document text
    • https://mipolapepel.weebly.com/uploads/1/3/4/3/134395859/kebibujizurejem_vazamideji.pdfIn PDF document text
    • https://site-1178488.mozfiles.com/files/1178488/toleninibuzuwoke.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xenavuxa/1405641049.pdfIn PDF document text
    • https://s3.amazonaws.com/duzexefemosaxe/bundesliga_spielplan_bvb.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF2 4940 bytes
SHA-256: 7250d741f9cbcb24caba07a8af0c0a8ffeab8e2bc62f80070d765adb9e5ad673
font_01_sfnt_off0000eed6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED6 11196 bytes
SHA-256: 36e58ef9acadee6725cab44d393544a25303753ac03b7a009ea4add88ccfa773
font_02_sfnt_off00011522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11522 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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