Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a554fceca9ffe61…

MALICIOUS

PDF

77.6 KB Created: 2021-09-16 02:54:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 94783f1e3947ed0c9e7a1c8695354b29 SHA-1: c3f2ce7873875294c525691006c9835d7c92e016 SHA-256: 5a554fceca9ffe613668ff68a83a2568e26185d42eb25abeae6eb168c9e04b63
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external domains, suggesting it acts as a downloader or redirects users to malicious sites. The PDF structure and embedded links are consistent with phishing or malware distribution campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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=all+my+love+led+zeppelin+tab PDF link annotation
    • https://doina.md/fckeditorfiles/file/dojewolovitagetiwa.pdfIn PDF document text
    • https://fceresources.com/ckfinder/userfiles/files/8894941343.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/19569407548.pdfIn PDF document text
    • http://cukiernia.eu/upload/files/lisokekakumemegi.pdfIn PDF document text
    • http://auto-spec.ca/fck/file/4324069803.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/lidufaxames.pdfIn PDF document text
    • http://khangvietdn.com/uploads/file/jikodagajorute.pdfIn PDF document text
    • http://saraya-shop.ru/upload/files/dalulezisawuloboxi.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/b00f4d929545005dedbbd7c68dface1c/61903669743.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613bbf1b7ebd1---bijot.pdfIn PDF document text
    • http://deurenhanger.nl/userfiles/file/koxedu.pdfIn PDF document text
    • https://auto826.com/uploads/files/98495930121.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/71789266025.pdfIn PDF document text
    • http://anabakorea.jp/userfiles/file/35443976196.pdfIn PDF document text
    • http://sushibelovo.ru/files/60650046232.pdfIn PDF document text
    • https://elitstroycraft.ru/source/file/redirelufu.pdfIn PDF document text
    • http://billedbutikken.dk/articlefiles/file/jubixujexosupovenam.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.com/FileData/ckfinder/files/20210911_4BE9D39ABAA33AE7.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/ropupifixowef.pdfIn PDF document text
    • http://ganteltechnology.com/system/userfiles/file/53301087903.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/62626856570.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_off0000c9d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e1ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1EF 10644 bytes
SHA-256: 282f4b901f4055412d59ba8bf04d3b35bc2ef7df1df51e4415dc39e5ae7e678d
font_02_sfnt_off0000fa16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA16 18180 bytes
SHA-256: c038e7e7ca38c2e63aeb4fd113de9384d734957a4d9ad4b3314caf7e9832e6de

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