Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e81d7065538b474…

MALICIOUS

PDF

75.6 KB Created: 2021-09-30 11:12:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2f64ade9166f610e023458e41d20123b SHA-1: e5a5f4c303360e7e6fd2f017da2dae9c020adcdf SHA-256: 3e81d7065538b474d2069a21733aa0385cd2c528d39b2474982f82a7b2960db0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URLs, many of which are structured as link farms on disposable hosting, suggesting an attempt to direct users to potentially harmful sites. The presence of embedded JavaScript, though not explicitly detailed in the provided evidence, is a common vector for malicious PDFs to execute further actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://coretry.ru/uplcv?utm_term=best+microsoft+office+for+android+tablet PDF link annotation
    • http://local-minicab.com/survey/userfiles/files/57025327140.pdfIn PDF document text
    • http://premiumdrinks.eu/userfiles/kubebujilonirasa.pdfIn PDF document text
    • https://gikguamerica.com/userfiles/file/pefibolanipewimapofo.pdfIn PDF document text
    • http://homeloanz.net/images/e/file/maxogida.pdfIn PDF document text
    • https://irantruck.ir/data/file/57407321274.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/92419711068.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/povutebe.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/70770352278.pdfIn PDF document text
    • http://villabrown.it/userfiles/files/57581811466.pdfIn PDF document text
    • https://hitourkorea.com/FileData/ckfinder/files/20210918_410BED605CD6EEDF.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/55585327873.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/6351525799.pdfIn PDF document text
    • http://teamhead.net/userfiles/file/kuvapejilar.pdfIn PDF document text
    • http://nova-auto.com/upload/2851297522.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/8fab5ef34c6b03fa1b73c2c1d769ee44/lugejavabulubawotajuguja.pdfIn PDF document text
    • http://tranhdaquydep.vn/upload/files/dadasabedipebarug.pdfIn PDF document text
    • http://shiny-baby.com/fileimage/file/xenepukiwokuto.pdfIn PDF document text
    • http://snsi.jp/image/news_file/gogaroso.pdfIn PDF document text
    • https://wineart.online/userfiles/file/migobopegixomuwin.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/98332370863.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/25869923377.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/29706940130.pdfIn PDF document text
    • http://adamlegal.com/userfiles/file/69213442055.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_off0000bfe9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d7fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7FB 18300 bytes
SHA-256: a0fef16cbd16c04fd257f0633ecdd48d425efb8604a1cc622ae20fa6a98856a8
font_02_sfnt_off00010736.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10736 10828 bytes
SHA-256: 4b7c013c2bd3138756418834e20d978d630bca139ec6a28adecc49affad07e58

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