Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd7374a825018c9a…

MALICIOUS

PDF

66.4 KB Created: 2020-12-27 11:42:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: d08c3f4cb30b401425afa3b1871f7835 SHA-1: 8839ada481cf292a37447bee6c10077650cccf23 SHA-256: dd7374a825018c9a0ed8a5f77884af834ef11044f74d21d952cdc0ec623a7780
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs pointing to disposable hosting services, indicative of a phishing or malware distribution campaign. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection further confirm the malicious nature of the file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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://traffnew.ru/strik?utm_term=translate+tagalog+english+bingi PDF link annotation
    • https://vepemetamat.weebly.com/uploads/1/3/4/3/134354227/majuxuseb_kaduzaralo.pdfIn PDF document text
    • https://penegekefifix.weebly.com/uploads/1/3/4/5/134586424/1475663.pdfIn PDF document text
    • https://cdn.sqhk.co/ligilitojob/bhfjjDx/guide_for_clash_of_clans_coc_mod_apk.pdfIn PDF document text
    • https://bogujodoj.weebly.com/uploads/1/3/4/8/134881838/3177802.pdfIn PDF document text
    • https://pobozopidukav.weebly.com/uploads/1/3/4/3/134384736/6362926.pdfIn PDF document text
    • https://tipowunukal.weebly.com/uploads/1/3/4/3/134355136/jugejejum_niwotezuseguj_suvupi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375891/normal_5fa00c90c34e6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/defeacc3-1c61-44ed-9162-c5a031fb0987/the_art_of_problem_solving_in_physic.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb08e381-b3bb-406f-914d-70c5b4e272a0/gurokejowatagodume.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2ad31a70-242d-4cd8-a042-4e53b3ddf9e9/zewatuzapevorigunanus.pdfIn PDF document text
    • https://s3.amazonaws.com/zuxadol/92257351672.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_off0000c881.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC881 5036 bytes
SHA-256: 1bf2cf8ff2cfdd954e6e65ada63191335174deec4666e0d3d717034e2a248dae
font_01_sfnt_off0000d994.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD994 10524 bytes
SHA-256: 66001e320bf839bd0752b59fd8677bc72d2d5e989d2e8c495af22106cd9960c2

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