Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a1d37a39f81faa1…

MALICIOUS

PDF

79.2 KB Created: 2021-09-17 12:00:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 34b0ed569911255ccba7938579aed691 SHA-1: 0c282f0367d609bf3cd71571c89662b1d763af81 SHA-256: 0a1d37a39f81faa1edd594e4379cfd8c49a5070043f8362df9e740e652e64f45
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://infrive.ru/uplcv?utm_term=among+us+free+download+pc+free', suggests a lure for downloading software. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://infrive.ru/uplcv?utm_term=among+us+free+download+pc+free PDF link annotation
    • http://fd-health.com/upload/ckeditor/files/jolebemu.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/3365795479.pdfIn PDF document text
    • http://radioevangilereal.com/assets/ckfinder/core/connector/php/uploads/files/bexuvatexivabi.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/4415401797.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/70877943707.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/pilepudubipawupipizejepud.pdfIn PDF document text
    • http://debandhelder.nl/ckfinder/userfiles/files/vezejetovuno.pdfIn PDF document text
    • http://sipsak.nl/userfiles/file/nisibedepaw.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/xujefazinazonisexorez.pdfIn PDF document text
    • https://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea28b84758---giwunelozekazizu.pdfIn PDF document text
    • https://reparationmobile.net/userfiles/file/bovebanog.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/68225985356.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/fa368d71705639b9ff077234d731756b/pimopik.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/61152134912.pdfIn PDF document text
    • http://youngthisyear.com/ckfinder/userfiles/files/29346890257.pdfIn PDF document text
    • http://freeski.hu/freeski/file/pigeloruk.pdfIn PDF document text
    • https://rajatotogroup4.com/contents/files/puvidefazosetuvigifev.pdfIn PDF document text
    • https://asiantms.com/ckfinder/userfiles/files/37979102153.pdfIn PDF document text
    • http://vinhthuan.vn/upload/files/31665563313.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/2501845212.pdfIn PDF document text
    • http://sportschoolindex.nl/images/uploads/39318228412.pdfIn PDF document text
    • http://nokianhakkablue.ru/ckfinder/userfiles/files/2764059004.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_off0000cdbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDBD 19040 bytes
SHA-256: ec2b67f71e883b3543ecd9fd5a9c5f0023c9d33f7ba5d0417c8f819a895e8992
font_01_sfnt_off0000fdb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000115cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115CD 10940 bytes
SHA-256: 3c5f36baeee4dd9fcf85abd6e92a002bac663c14bbc2de0d134efe9d8447f0c3