Malicious PDF — malware analysis report

Static analysis result for SHA-256 957e5fe81e0b91c5…

MALICIOUS

PDF

66.4 KB Created: 2021-02-25 13:56:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: b3d048cf72d51b06f0da56a3e0f62d72 SHA-1: de127643ea2cc944d9a2ebbad910e8d1a877cc4b SHA-256: 957e5fe81e0b91c58fdffe11edcf6d4e651c223bbc00ef900ec5c9c294dad299
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

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://druttle.ru/award?keyword=ge+healthcare+bangalore+contact+number PDF link annotation
    • https://valiwuvubeke.weebly.com/uploads/1/3/4/6/134694219/waritidilusama-dopujovex-degaxapedaz-sopikigatuzu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409096/normal_5fd959beb8de9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463560/normal_5fe4da18a9e34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5fcedf502ba2b.pdfIn PDF document text
    • http://lajodibibodi.getenjoyment.net/which_narnia_movie_comes_first.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/pavefivaruwifutivimak.pdfIn PDF document text
    • http://xerometofu.iblogger.org/husqvarna_372xp_price_in_india.pdfIn PDF document text
    • http://zonerokemub.getenjoyment.net/yard_machine_riding_lawn_mower_wont_start.pdfIn PDF document text
    • https://rijadotijijani.weebly.com/uploads/1/3/4/4/134470018/82b4f767b4b9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zupitatip.atwebpages.com/15697329981.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/zefakoligaretagovamamaxe.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_off0000c953.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC953 5208 bytes
SHA-256: 0f8ca608e9bea211b58981914fc223d2da9174d0c2491a0fb6cfe06a4ad81665
font_01_sfnt_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 9972 bytes
SHA-256: 4134dd389937cd4196c2dba96bace024120a6a5a62380a802e843db20fc4fbb6

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