Malicious PDF — malware analysis report

Static analysis result for SHA-256 8da5c8dcffb24cc1…

MALICIOUS

PDF

89.2 KB Created: 2021-06-01 15:34:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 0d9d6bea9c83bd5513ab0481b5ead5ea SHA-1: 175e32f03ada374bf7788c2ff47e4e818f69cafc SHA-256: 8da5c8dcffb24cc1600e83a5814ee53a93d70e413c236962070232b16f71a130
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a phishing attack that likely leverages embedded JavaScript or exploits to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://wastran.ru/pbw?utm_term=commercial+electric+digital+multimeter+300v+manual PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4368494/normal_600a7ca9d8eee.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491933/normal_5ff3c3cc3579a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407070/normal_5fd3b4bc01f79.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490266/normal_60319904cae3d.pdfIn PDF document text
    • https://vuwodasoruza.weebly.com/uploads/1/3/4/4/134436366/8536313.pdfIn PDF document text
    • https://gavuwili.weebly.com/uploads/1/3/1/0/131070236/xinikogesa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_6043353f0d1f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481518/normal_5fd99f906faf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408343/normal_601dca466f8b8.pdfIn PDF document text
    • https://godenikoboj.weebly.com/uploads/1/3/5/3/135322408/sexinobetiv.pdfIn PDF document text
    • https://puwakama.weebly.com/uploads/1/3/4/4/134474688/kuworeme.pdfIn PDF document text
    • https://vewutaniwem.weebly.com/uploads/1/3/0/8/130873717/2886062.pdfIn PDF document text
    • https://sisilodoja.weebly.com/uploads/1/3/1/4/131406442/260961.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367668/normal_5fcf4aecef922.pdfIn PDF document text
    • https://wejumarokurefa.weebly.com/uploads/1/3/0/7/130776247/5905392.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/bd6721b0-70a3-4113-912e-93191898de8a/dbx_share_price_forecast.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afaf8e89-1281-4179-883b-e74a0c511f41/41408747389.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/where_can_i_read_the_untamed_manga.pdfIn PDF document text
    • http://pupowivala.pbworks.com/f/bedejezezukaxigusapija.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/nasunuxeveda.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/vaxamozubobu.pdfIn PDF document text
    • http://xedidovetaw.pbworks.com/w/file/fetch/144414780/61052294162.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08f76d3f-1f0e-44c5-aeaa-a38965124cd2/arbys_menu_5_for_10.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000facb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFACB 5352 bytes
SHA-256: 02b2a9a781667e1ba4d24bdf3867abf565a76f686c61388ecdca4f6114a75e0d
font_01_sfnt_off00010ca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CA5 6252 bytes
SHA-256: 83a486a56c5e4d14ed8761275b64361fba19a86f21d5406f4638b9f37aa00e44
font_02_sfnt_off00011bd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD4 12536 bytes
SHA-256: b1cc389647f93032d4313f076e75d92cf80edd7b4ba85d0dad28d1a4ea5bd08f
font_03_sfnt_off0001467a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467A 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e

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