Malicious PDF — malware analysis report

Static analysis result for SHA-256 1822c61817e6713d…

MALICIOUS

PDF

74.2 KB Created: 2021-09-21 08:12:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b1435a506d40af52994c2cb6055d003c SHA-1: b757d71c14ed7c62e7bc07bcd252eadf7b32682f SHA-256: 1822c61817e6713d283fbc21a053f4e631de318c51c8c54751e9b41a40977574
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs, many pointing to disposable domains or link farms, suggest a phishing or malware distribution campaign. The PDF structure and embedded links are consistent with attempts to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://nomylo.ru/uplcv?utm_term=best+indian+movies+website+online PDF link annotation
    • http://personal.sut.ac.th/chantira/port/ckfinder/userfiles/files/wovuvurofesoronazap.pdfIn PDF document text
    • http://olynskiconstruction.com/pics/file/98528446734.pdfIn PDF document text
    • http://gesht.ru/admin/ckfinder/userfiles/files/83771923778.pdfIn PDF document text
    • http://deborahkay.com/ckfinder/userfiles/files/dumime.pdfIn PDF document text
    • http://deforma.it/userfiles/files/fenepemuvulizetavob.pdfIn PDF document text
    • http://rowerowaszkola.pl/imgturysta/files/wowipevaz.pdfIn PDF document text
    • https://igruppe.no/ckfinder/userfiles/files/koxupowojipanojagezowavo.pdfIn PDF document text
    • http://benthanhsgfarm.net/images/uploads/files/10169235488.pdfIn PDF document text
    • http://simsvizag.com/admin/uploadedfiles/file///kifizowarurekepu.pdfIn PDF document text
    • https://china-glass-mosaic.vegner.com/userfiles/files/20210914_031947.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/91797419427.pdfIn PDF document text
    • http://tdvvietnam.vn/webroot/img/files/ganuzitaxitu.pdfIn PDF document text
    • http://haki.vn/uploads/files/81266588334.pdfIn PDF document text
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da349e3f46---dakerewakolujikusuw.pdfIn PDF document text
    • http://lawina-radom.pl/files/file/62789155744.pdfIn PDF document text
    • http://xn--aknmedical-yub.com/uploads/file/57619753213.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/demivenosukozox.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/31906881195.pdfIn PDF document text
    • http://ozhelalikram.de/resimler/files/womezonokudilol.pdfIn PDF document text
    • http://yizhu580.com/ckfinder/userfiles/files/mozefubusaretolewofu.pdfIn PDF document text
    • https://tes-sys.com/uploads/ckfinder/files/20210909/16311439243283.pdfIn PDF document text
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/77422444148.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_off0000bf00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF00 16760 bytes
SHA-256: da75a2ec94a29d249e7ca4fd5221c88d1b21eba5647266c4334a31ec686fea68
font_01_sfnt_off0000ea61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA61 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10278 10656 bytes
SHA-256: b383ca25211227d9badbe540d8e38cef420ea24243c442b5a6d77f53dfdb1446

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