Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b466774267af080…

MALICIOUS

PDF

88.6 KB Created: 2021-03-22 03:46:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 081c6b1d75c04206c39dde3ce7d9e86b SHA-1: db1bc931773f4d203f372bf59da237809b2f1f09 SHA-256: 5b466774267af080b55830c1433342b0433dccaa9bd1576188e84ed29d82648c
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 domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded content, though obfuscated, appears to be a lure for the 'Lazarillo de Tormes' PDF, directing users to potentially malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://jumiwimov.ru/strik?utm_term=resumen+de+la+obra+lazarillo+de+tormes+pdf PDF link annotation
    • http://gagogepatajebe.medianewsonline.com/sylvia_plath_quotes_about_writing.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/exercice_milieu_segment_ce2922jj.pdfIn PDF document text
    • http://luxshop21.site/aur_ahista_kijiye_baatein_song_downloadgw3ht.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369655/normal_5fe6512233d3a.pdfIn PDF document text
    • http://jsexj.fun/british_superbikes_2019_standings93ed0.pdfIn PDF document text
    • http://meweremidef.iblogger.org/federal_arrest_warrant_form.pdfIn PDF document text
    • http://gowanenutik.mypressonline.com/90463699552.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366343/normal_5fe8f183dd16c.pdfIn PDF document text
    • http://kismykeitio.best/waltzing_matilda_koncz_sheet_music15hdy.pdfIn PDF document text
    • http://ca-management.website/salesinajoluzufunamesohkilb.pdfIn PDF document text
    • http://vupiziriwopo.22web.org/53430324515.pdfIn PDF document text
    • http://basumoxivor.sportsontheweb.net/xomireredezomadopekavolix.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/6acb8fda-6c21-4eca-a47b-cd4fc567d5c5/72301666501.pdfIn PDF document text
    • https://ce099f17-eb12-430b-a452-8d789b3ee5a8.filesusr.com/ugd/aef5b7_22c374fa01ca4697a2bc3c30d773061f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6bfd335-be79-4043-994b-384770eb4091/xojegodixaderipene.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9aff1ed2-cf59-4442-adb5-8f23cbefa8c7/buzarajiwalu.pdfIn PDF document text
    • https://80c93ba6-74df-4afb-9852-3a83eaba20e3.filesusr.com/ugd/4cf28d_34a110c0f4464c63baab1a8d9a5a1555.pdf?index=trueIn PDF document text
    • https://34ea5197-a9e9-4ba5-99bb-a7dd7aeba98b.filesusr.com/ugd/234f58_885ff49cd85d46dcb8184a77b3227cee.pdf?index=trueIn PDF document text
    • https://000bb656-a8cb-4e8b-9327-0b0ec99f56fe.filesusr.com/ugd/3f812e_e523a32c6bb24613ab253f25624b9b75.pdf?index=trueIn PDF document text
    • http://gununusaw.epizy.com/44682307111.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7f61b37-2ea4-4f23-94b3-4adf0b7de66a/gatodafipiponepadoxi.pdfIn PDF document text
    • https://0491f86b-060d-4f4a-be23-b0d01488777f.filesusr.com/ugd/faa7ef_956082c12a6b4332a9d9d986aa0cb89a.pdf?index=trueIn PDF document text
    • http://relamelekubapan.epizy.com/3933647910.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c83da4ec-e1a1-4484-83ee-fd3f7d3c405a/fefivitu.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_off00011ad2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AD2 5384 bytes
SHA-256: 3e2d8006939ae1b620cf3195c0cfedd114b6434564ddf1da1f9f2954f6f3232a
font_01_sfnt_off00012d0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D0B 11624 bytes
SHA-256: de3e575f626125b9496635ec2116e3b9b62cdcf77de1b86114fd97b4a81606f5