Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b80f511c20bb997…

MALICIOUS

PDF

74.1 KB Created: 2021-03-02 20:16:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ad4c269163aa2f4752b8591839e91b6e SHA-1: 0c068bfe2d6431b6ae5d6651aef7092241b2d62d SHA-256: 8b80f511c20bb997e580eb60f4ad67f900fdd55f517e29ee2fe477e05d3d4fdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, which is indicative of a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the presence of numerous external URLs points to a watering hole or redirection strategy.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://fokemale.ru/strik?utm_term=saga+el+nombre+del+viento+orden PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fd1c3fb31d6d.pdfIn PDF document text
    • https://xalipifizipig.weebly.com/uploads/1/3/1/3/131379045/2809331.pdfIn PDF document text
    • https://worivoka.weebly.com/uploads/1/3/4/5/134588103/5519734.pdfIn PDF document text
    • https://wulodegekejiwa.weebly.com/uploads/1/3/4/2/134266030/wogifode.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393637/normal_601f9e92980b7.pdfIn PDF document text
    • https://cdn.sqhk.co/texafikogot/g1jbjjq/jepogejipimopawoba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5fffa662a5795.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390071/normal_5fe589d056f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462678/normal_601b3cb9a5a32.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481528/normal_5fdc7983cde7a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_600bf0b50b55f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410201/normal_5ff14bf80a472.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445119/normal_5fe4ef64e222a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422909/normal_5ff60707aabc7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rezufuj.rf.gd/lezadozozipibomax.pdfIn PDF document text
    • http://xisevigelunadiv.epizy.com/the_count_of_monte_cristo_full_movie_cast.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_off0000e248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE248 5272 bytes
SHA-256: 17c05037fdf58dbc71c1f887896a8c91174e50d79a9a3744938dbfc6c4535f97
font_01_sfnt_off0000f41f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF41F 11584 bytes
SHA-256: 8e3aff8f8365284be49950f74bfdbce0b3a3f99f92815f81e2bd7845f14ac321

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