Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab8432b2f41897b…

MALICIOUS

PDF

78.3 KB Created: 2021-05-15 20:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 75f980cc8d38ffcbc65fd87104a6dcc1 SHA-1: 42e70071a92b78c76bf93c8678bb884a6375c3dd SHA-256: 3ab8432b2f41897b433828249eae51f895c75839be61a0c68d5f16774007cacc
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, 'https://ponafet.ru/strik?utm_term=what+is+bram+stoker+famous+for', is particularly suspicious and likely leads to a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ponafet.ru/strik?utm_term=what+is+bram+stoker+famous+for PDF link annotation
    • https://sudarotabodubig.weebly.com/uploads/1/3/1/4/131407445/benuvafokapesa-xerizuloneko-wuxigejutotuv-gabawi.pdfIn PDF document text
    • https://zonulezewuras.weebly.com/uploads/1/3/4/8/134890742/8540098.pdfIn PDF document text
    • https://xikanunifozale.weebly.com/uploads/1/3/1/8/131860479/mibiwazo.pdfIn PDF document text
    • http://zurujavurobe.scienceontheweb.net/gemebepimisetapo.pdfIn PDF document text
    • https://fugiweritukasuj.weebly.com/uploads/1/3/4/6/134682589/fukusaliwi.pdfIn PDF document text
    • https://savejesala.weebly.com/uploads/1/3/4/6/134668282/tupinegamerose.pdfIn PDF document text
    • http://magexaxajatadog.getenjoyment.net/jizumidezajuvonoxiweguwe.pdfIn PDF document text
    • http://nopezimugabotik.mygamesonline.org/how_deep_can_you_go_with_padi_advanced_open_water.pdfIn PDF document text
    • https://wuxebejodivo.weebly.com/uploads/1/3/6/0/136030931/wotomalika-zidonejitu-muruvof.pdfIn PDF document text
    • https://balevowoperat.weebly.com/uploads/1/3/1/3/131397989/5659521.pdfIn PDF document text
    • https://diwopasod.weebly.com/uploads/1/3/4/4/134475510/jaxuxidikesafugi.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/dupematugejowabiweripo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f495c71d-628d-4070-9a3d-b699cbb46ba4.filesusr.com/ugd/d99ef3_52068a8ca4974229a71277f80d0e247f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df297da1-91ba-46a3-a3a6-c6bcca196a8c/55752626604.pdfIn PDF document text
    • https://e8dc5420-792a-4861-90db-09cfc8d8a7d1.filesusr.com/ugd/1378f5_8af7cf4cc33f4a158b7fce98cc85ccd2.pdf?index=trueIn PDF document text
    • https://3bcdeb60-9876-4d14-bc0a-1dd1632c647c.filesusr.com/ugd/16a96a_c82c050548744fa3b861bbeb30352d97.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6c754a1-0a17-4218-9dec-e65191334fe7/nobemebigugiwovurim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7aed042-90e4-40bd-ab47-321f7171015a/82830778298.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e72125b-4eaa-40d7-ba09-348313a125d3/are_german_wirehaired_pointers_aggressive.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8575aaa5-34e8-44ea-95e8-6bf20f42a8d6/gravely_148z_owners_manual.pdfIn PDF document text
    • http://larovitivejel.atwebpages.com/15786364478.pdfIn PDF document text
    • https://1ec9b6e7-17eb-4e1e-a994-ba5ce4cbdb7c.filesusr.com/ugd/d4a9d6_2363ec4f6d924c7a8f3c3e5d23c41344.pdf?index=trueIn PDF document text
    • https://c6b89c2f-dc7d-490d-a648-077c51828da9.filesusr.com/ugd/29ab01_e080a3d01d504a669a638a4bfe849178.pdf?index=trueIn PDF document text
    • https://6b54b0b2-91db-43cc-88c8-bbc4f7e20b37.filesusr.com/ugd/a773aa_dc74ecbb45b94c329b66d1d11308ac34.pdf?index=trueIn 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_off0000f248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF248 5192 bytes
SHA-256: f774d0b9d06959dd9451c35568d1c93a8ec0eef0d966a08f07e9011ce2ac177c
font_01_sfnt_off000103d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D4 12508 bytes
SHA-256: 6b2e9c1daf90c169937d951cd1d0b900d2be96c176a768a640ba118292572286

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