Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c22a036577daa02…

MALICIOUS

PDF

83.8 KB Created: 2021-04-14 02:02:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: ee1f2801ab4c8356f6ebe603113f759d SHA-1: 6a1d377f9d5562dda5ab7d357fbf903947c340b3 SHA-256: 1c22a036577daa026e9afc0c59d32724e78196bf38364ace14a74f31130154e1
186 Risk Score

Malware Insights

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

The PDF file contains embedded links that redirect to a link farm, as indicated by the 'PDF_SEO_LINK_FARM' and 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristics. The primary malicious URL identified is 'https://resalured.ru/strik?utm_term=two+way+radio+headsets+for+sale', which appears to be part of a phishing or SEO spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://resalured.ru/strik?utm_term=two+way+radio+headsets+for+sale PDF link annotation
    • http://zavudonalu.66ghz.com/74015286157.pdfIn PDF document text
    • http://nitanupemil.mygamesonline.org/delegation_process.pdfIn PDF document text
    • http://mosebuzixat.mywebcommunity.org/john_owen_the_doctrine_of_justification_by_faith.pdfIn PDF document text
    • http://jebifawulu.mywebcommunity.org/72871749144.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/3b5da5e7-b882-4cf1-bac5-c9eacbb328f3/vapola.pdfIn PDF document text
    • http://boribasumagit.epizy.com/42511284128.pdfIn PDF document text
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_e6a4edbf4d7c4db39a7af14cfec9e27c.pdf?index=trueIn PDF document text
    • https://e22e8d81-f41f-4d51-abb1-39b19d2d32bb.filesusr.com/ugd/96bf9d_fb75acb0de374001b83be4621e4da402.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bbbca85b-7960-4cf9-83c1-959ab412bd0d/70438371120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b59a18c6-bd35-4f17-ba88-cfea3c5c02f1/65190574540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d688c993-c63c-4aaa-a72c-382ee2e26bc7/ccnp_route_300-101_pass4sure.pdfIn PDF document text
    • https://59b7e61f-9850-45ee-add2-e9646db267e4.filesusr.com/ugd/5b9365_e4d171bafa43434fb932486689388791.pdf?index=trueIn PDF document text
    • http://jumawivowibeb.onlinewebshop.net/4652140616.pdfIn PDF document text
    • http://tulufuparogig.epizy.com/nifirebolugesirupilijukas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfcb34ff-0d2e-45b1-971a-3f35508a56f1/vibudalomowononanixote.pdfIn PDF document text
    • https://a3720f92-bdaa-4449-a3ff-14f36884d2d5.filesusr.com/ugd/afadc3_985d82e0caa3467e8a6c23d4ce8e0c73.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bef5bfa4-4f81-4c3b-a4d2-92faaba99e75/pazukivubiwokumofijudeb.pdfIn PDF document text
    • https://76ed6b59-b034-43ac-b949-e1c08f76e3cb.filesusr.com/ugd/ee6100_3f8955647bae4bedb9470b6cc1cdc78e.pdf?index=trueIn PDF document text
    • https://04650017-3ca5-4b28-9d9b-11da2816551d.filesusr.com/ugd/aa03de_04e9e43738cf4e7288f1b8cf55a0a4f3.pdf?index=trueIn PDF document text
    • http://sonisan.epizy.com/treasurer_s_report_for_church_agm.pdfIn PDF document text
    • http://botawaxugeb.epizy.com/sovegemukelu.pdfIn PDF document text
    • https://2a009ac4-5770-49f2-ae16-4ce107243443.filesusr.com/ugd/59deca_e30216435ce4472fa34925c0f017ff24.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/420187d6-7870-4fd8-86eb-a7a8ba98363a/dd_3.5_savage_species_feats.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_off00010c59.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C59 5136 bytes
SHA-256: 14c017a6e88b32d27c6fe1af76b4797fe927e012e930e7f2251387119d34a2dc
font_01_sfnt_off00011de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE3 10936 bytes
SHA-256: 9d37ff0fb7840b9c8a5acf3b3d7d1b4703d068163a378ddaefa9e7dd722c306c