Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf2d032e896820f…

MALICIOUS

PDF

82.9 KB Created: 2021-03-25 10:13:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 594320978e9cf78ecda81eac50b91a8f SHA-1: cc130ec9753ff627bf1e05291c6394a1833e69aa SHA-256: dbf2d032e896820f5223f5148b6f75d905b01635085da2b8977eff28014610e3
244 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm hosted on disposable domains. The ML classifier also strongly indicated maliciousness. The embedded URLs, such as 'https://crophysi.ru/strik?utm_term=the+choice+is+yours+skyrim+nexus', are indicative of phishing or malware distribution attempts. No scripts were extracted, but the structure and URL patterns strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://crophysi.ru/strik?utm_term=the+choice+is+yours+skyrim+nexus In PDF document text
    • http://whitetwo.space/21036560681dwt2n.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/37999884035.pdfIn PDF document text
    • https://rovagurepuj.weebly.com/uploads/1/3/1/8/131856033/5603302.pdfIn PDF document text
    • https://fukuperuka.weebly.com/uploads/1/3/4/8/134883813/resarorutis.pdfIn PDF document text
    • http://kersita.fun/bissell_turboclean_powerbrush_pet_wont_spraysrnhd.pdfIn PDF document text
    • https://nopifabuda.weebly.com/uploads/1/3/4/6/134693299/5622572.pdfIn PDF document text
    • https://cdn.sqhk.co/ruxodinumoro/hjeOhae/rotodilebukonadijigeval.pdfIn PDF document text
    • https://cdn.sqhk.co/sofizagumup/giH1jdo/space_racing_star_race_mod_apk.pdfIn PDF document text
    • http://copyright-central-media.com/what_is_meant_by_philosophy_of_life_in_tamilg8xko.pdfIn PDF document text
    • http://puvepum.getenjoyment.net/89851482434.pdfIn PDF document text
    • http://topdouche.xyz/tazemugsfwwj.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/b28837e2-fed7-4d01-8c5b-4ab8d42ac246/niveles_de_medidas_preventivas_covid_19_andalucia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac8fe648-1ecc-47b0-a398-701466953847/zokis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888b50c4-59c2-4951-a33b-e6ef4abf34d6/83894190769.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/62646db6-03ae-4e06-a9bc-d915cef842f7/9760941180.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69719d0a-eca8-4689-a106-e131014492fa/81546608482.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_off000108e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E5 4980 bytes
SHA-256: 44b8921c4b950435daf1acf8cdbc6c18e11d8214101912a599154f02be03ad7a
font_01_sfnt_off000119ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BA 10988 bytes
SHA-256: c8c002be7bf90b71d5ed899688a2d20f878d2a5b12260bc144d28c78a24dfc9c

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