Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3081bd0c5c6dc84…

MALICIOUS

PDF

70.5 KB Created: 2021-09-27 08:03:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ffa5f0603147c2f97ef86abffdf7d5ba SHA-1: 87844a30500ec387a6f41c61ff4fac332b505a7c SHA-256: b3081bd0c5c6dc84576dc59f64f8c35c11b25fde498eb0fbbfe35a351b5c2c48
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous external URIs, many of which are hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the heuristic indicating a link farm strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://crewmak.ru/uplcv?utm_term=vcf+file+not+open+in+android PDF link annotation
    • http://rungrawin-itt.com/userfiles/files/11061767453.pdfIn PDF document text
    • https://securitydm.eu/slicice/file/panitenogozo.pdfIn PDF document text
    • https://ziyang100.com/userfiles/file/art_16324023525288.pdfIn PDF document text
    • https://projetounificado.com/uploads/files/30484804200.pdfIn PDF document text
    • http://xn--oy2b19v1mb1yi.com/userfiles/file/94343110893.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/kokomevedo.pdfIn PDF document text
    • http://frutapac.com/ckfinder/userfiles/files/89297965054.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/40532795279.pdfIn PDF document text
    • http://novena99.com/uploads/files/202109060211254984.pdfIn PDF document text
    • http://sakuragiramenandsushi.com/uploads/files/40186921107.pdfIn PDF document text
    • http://bakineshr.az/ckfinder/userfiles/files/15023618311.pdfIn PDF document text
    • http://etabetasurvey.com/userfiles/files/dafabujixoku.pdfIn PDF document text
    • http://reckdance.pl/userfiles/file/nobavilorikiza.pdfIn PDF document text
    • http://hasadtemizlik.com/upload/file/jofibobulawisevin.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/namob.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/fifudasifevatas.pdfIn PDF document text
    • http://3q1p.com/upload/file/2109151008228906266s0n13h641dy.pdfIn PDF document text
    • https://mar3ol.com/Files/files/sulapopivedelitezu.pdfIn PDF document text
    • https://soosekszer.hu/upload/files/56883377873.pdfIn PDF document text
    • http://redskap.ru/userfiles/file/88930099215.pdfIn PDF document text
    • http://xn----9sbkvfu2aex3d.xn--p1ai/ckfinder/userfiles/files/raxoruxoresafuzuso.pdfIn PDF document text
    • https://mkontroll.hu/File/6765514635.pdfIn PDF document text
    • https://itscebu.com/upload/file/20210910080206.pdfIn PDF document text
    • http://kraljicabih.com/wp-content/plugins/formcraft/file-upload/server/content/files/161334131120fa---869979470.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_off0000b1b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9CA 10412 bytes
SHA-256: 15821e582ed3b51fdc2cd6e44ac1ee3643f5f9671c7468e9fd2549e8677117c4
font_02_sfnt_off0000e172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE172 16780 bytes
SHA-256: 1c7662172e99da6d91ed9bd51265a441d556958443d8ad86d2419f427c2f09e2

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