Malicious PDF — malware analysis report

Static analysis result for SHA-256 c121f87443d2159e…

MALICIOUS

PDF

74.2 KB Created: 2021-05-13 04:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 32ae8326c44332875258641bbe341057 SHA-1: f698d98f7243d74bd0a5e97abcda692e99046d50 SHA-256: c121f87443d2159ed29597a28d490305f18dca243b2263fcef4885599840d669
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or malware distribution attempt. It contains numerous embedded URLs, with one prominent external URI pointing to 'https://zajinet.ru/strik?utm_term=kitten%2527s+first+full+moon+book', suggesting a lure to a potentially malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating the PDF is designed to host many links on disposable hosting, likely for SEO manipulation or to distribute malware.

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
  • 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://zajinet.ru/strik?utm_term=kitten%2527s+first+full+moon+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405953/normal_604cf39b32f31.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368494/normal_6010d45787775.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460473/normal_5fce7742018cc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454435/normal_5fe50a84e6f60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fde73567080f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425238/normal_5fcb3cda423bf.pdfIn PDF document text
    • http://dabukim.mygamesonline.org/banking_act_switzerland.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500667/normal_601b27a8aee92.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462982/normal_605b99849eb92.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/cfaa16d3-dc03-4ffd-b606-f9f6f4fc4481/63240674824.pdfIn PDF document text
    • http://bupalim.atwebpages.com/accounting_concepts_notes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3d50b24-2f68-4c0d-a29b-0da41c5458ec/67381774843.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92be2e15-2aef-4d85-a4a2-69c3c73a5d15/how_to_find_angle_of_line_in_illustrator.pdfIn PDF document text
    • http://totefopige.atwebpages.com/papeguwij.pdfIn PDF document text
    • http://zimopup.myartsonline.com/kukilatenexite.pdfIn PDF document text
    • http://vonanovab.epizy.com/upsee_syllabus_2018.pdfIn PDF document text
    • http://xilavivugup.epizy.com/71071196244.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e436b2e-92d3-4c5a-a1f3-af429618f8d0/10_types_of_figurative_language_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e466b16-3f8f-46d7-a2eb-9ac3ed5ffeb7/what_is_child_centred_practice_in_early_years.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_off0000e4f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4F5 4912 bytes
SHA-256: 6e677b9cbf5c943db4011531817e450bf076f39c098c17c2b7e4b064247f8b7a
font_01_sfnt_off0000f59b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF59B 10500 bytes
SHA-256: b6493adf8467786336ea47cedd163ed3082a18fb83b4c0d2e5988dd00d70a525

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