Malicious PDF — malware analysis report

Static analysis result for SHA-256 071b8461553df4a8…

MALICIOUS

PDF

68.7 KB Created: 2021-10-03 22:32:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5a56e544266dbc56e2e6b81b728c43d3 SHA-1: c9d0606977fcb725b614b678f6b28ee373770462 SHA-256: 071b8461553df4a8002cd814fbf1724f5e226b0c2da09d24542c69d6a5836874
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable hosting, characteristic of a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • 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 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://cructi.ru/uplcv?utm_term=php+reference+manual PDF link annotation
    • http://volareinmongolfiera.it/userfiles/files/lexunalizajofe.pdfIn PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/16550877627.pdfIn PDF document text
    • http://sirinthepgroup.com/userfiles/file/24215678434.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/mapiwijiwakiraguj.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202109041819306303.pdfIn PDF document text
    • http://kant21.com/userData/board/file/52656232705.pdfIn PDF document text
    • http://cokhixnktientien.com/Images_upload/files/64200539512.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/c20f70f15f957cdd758205ade6dcb61b.pdfIn PDF document text
    • https://taxforce.nl/userfiles/files/94733636672.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/89242192747.pdfIn PDF document text
    • http://kusistoconstruction.com/userfiles/file/mefalemitifiwumidumo.pdfIn PDF document text
    • https://senegal4d.com/contents/files/visefun.pdfIn PDF document text
    • http://otestmanager.org/club/data/userfiles/file/20210925040014.pdfIn PDF document text
    • https://designclarf.it/file/41307028638.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/41240003311.pdfIn PDF document text
    • https://alperbehang.nl/userfiles/file/56540920770.pdfIn PDF document text
    • http://auksozvynas.lt/userfiles/file/natadoguburug.pdfIn PDF document text
    • https://sunriseinnjasper.com/nbloom/fckuploads/file/22162655716.pdfIn PDF document text
    • http://kondicionery-shodnya.ru/upload_picture/file/30846182633.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/21450067703.pdfIn PDF document text
    • http://frutapac.es/ckfinder/userfiles/files/2928860567.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/gosefudakosom.pdfIn PDF document text
    • http://deauville.ru/files/file/43510488198.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0D6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8ED 10368 bytes
SHA-256: a45bac322f8c280dd13b7724393bfb1fd1ec2735ce581651a1b8b36190a46361
font_02_sfnt_off0000e01d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01D 14620 bytes
SHA-256: 1bc672b553139a2e8421461d09d6f3e4f5113ab20804d05d5f1181c1db52b0e5

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