Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad25a6cee89de110…

MALICIOUS

PDF

84.5 KB Created: 2021-04-06 11:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70bd671eb1933220b304dbb2a154f576 SHA-1: 41c038aec51230e274d78a2ef98ae4b013a1e686 SHA-256: ad25a6cee89de110e841a3e19874639f50abf3bded71feb4a13f0cf606e15f74
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics as malicious, including ClamAV detection and an ML classifier. It contains a high number of external links, many of which point to a URL that appears to be part of a link farm designed to distribute malware or phish users. The presence of a 'Password-protected archive handoff' heuristic suggests a common tactic to bypass security scanners by encrypting the actual payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://pelibifir.ru/strik?utm_term=vtech+landline+phone+with+answering+machine
    • http://ferategaj.scienceontheweb.net/unitized_curtain_wall_details.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/66f508c3-5427-4cb8-a432-2e66c2262253/nofodukovewewozose.pdf
    • https://uploads.strikinglycdn.com/files/361a1856-f12a-4b8a-8051-a798229244de/5147093166.pdf
    • https://uploads.strikinglycdn.com/files/61efa226-1f52-46c8-acab-c143d45bf3b7/27031990261.pdf
    • https://a7ed8af5-5e4a-4eaf-98d7-51655494ca15.filesusr.com/ugd/b5c45a_f092986d93a94a11aedbb8aac4f93fc2.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90501b55-7284-458a-88d4-4687800cc60e/manuale_istruzioni_suunto_x-lander.pdf
    • https://uploads.strikinglycdn.com/files/6987a0f1-3113-410b-9d83-3e6a223dbacf/dirabedozipuxukaru.pdf
    • https://6b2f37ea-3696-4b87-858b-663c379f6f6f.filesusr.com/ugd/16879a_a42c7a70887b42ab894e2d057f26c7bc.pdf?index=true
    • https://6c71f620-b6e5-46cc-9e58-526c5f0a7a41.filesusr.com/ugd/1c90dc_63e61c935efe4417b1a7a575cb316479.pdf?index=true
    • https://s3.amazonaws.com/wanasuvedigo/vujulomifaxalujulelapug.pdf
    • https://uploads.strikinglycdn.com/files/c1fb9628-4c88-4a2e-a2ff-a46ab5cf6868/32212427243.pdf
    • http://kuzemepusiloj.onlinewebshop.net/kazex.pdf
    • https://s3.amazonaws.com/guxosa/enterprise_risk_management_models.pdf
    • https://uploads.strikinglycdn.com/files/0c584dcd-7185-4c33-8eb6-7ee4ce6fd89e/jafilurenorapoguketo.pdf
    • https://uploads.strikinglycdn.com/files/6be06852-7af9-49c4-9db5-5861a0ed553b/24049389548.pdf
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_276f8dbd1894450d9d94ea79b3032aa9.pdf?index=true
    • https://67258aaf-84c5-4a88-bfd2-1aa7ddb6c27a.filesusr.com/ugd/850f07_309763df09bd456e9162ccca138aed8a.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3ca9ec97-ba2b-4095-93c9-966032edcaa8/cobra_acxt390_walkie_talkie_manual.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4a.bin
67916aa1eaca99fd69ecc95b5d167fe23ca9a45fad43cb7937bfe8e7746a99b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4A 5332 bytes
font_01_sfnt_off00011045.bin
2f51a654f2eec85a402a392851ae9b8404505e1d7bcfad5cbc4cfb2a7f1253aa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11045 11256 bytes
font_02_sfnt_off00013697.bin
7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13697 4324 bytes

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