Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a8da74be9f2feaf…

MALICIOUS

PDF

75.3 KB Created: 2021-09-25 23:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7b8638fa7bdb3b841b36a7337e9b4f84 SHA-1: 7e57f620c70de500afda7a58fb51a0ebda388990 SHA-256: 1a8da74be9f2feaf86d1a8e51fd994e11daa2d438e01b5d44d3e69fa13bcbef3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan. It contains numerous embedded URLs that point to disposable hosting and function as a link farm, a common tactic for phishing or distributing further malware. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high volume of links to distinct, potentially disposable hosts, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=android+despertador+telemovel+desligado PDF link annotation
    • https://mobile-translator.eu/app/webroot/media/files/71705344439.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/55404095869.pdfIn PDF document text
    • https://drticket.ir/basefile/drtiketcom/files/zavalajazomexaven.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210922210905.pdfIn PDF document text
    • http://maybaobidinhdinh.com/upload/files/79782542659.pdfIn PDF document text
    • https://trompis-tondschungel.de/userfiles/file/20165927665.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/87163081101.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210925214748.pdfIn PDF document text
    • http://happyorderfood.com/uploads/files/sofulupubajobuz.pdfIn PDF document text
    • http://abpjseah.news-read.com/upload/files/kidofesurazanabotebenem.pdfIn PDF document text
    • https://dolmalatrek.com/userfiles/file/2954059496.pdfIn PDF document text
    • http://onlinetalk.jp/app/webroot/img/fckfiles/file/40441537380.pdfIn PDF document text
    • http://alrabbancapital.com/file/files/wofevesijireluwuj.pdfIn PDF document text
    • https://bomando.bomsolar.com/uploadfiles/files/saxatiwiranazafonutun.pdfIn PDF document text
    • https://cfacgroup.com/uploads/FCK_files/file/83692019477.pdfIn PDF document text
    • http://brlairport.com/images/file/gusokezesiwemepojanabiko.pdfIn PDF document text
    • https://amzentransportationindustries.com/admin/imagetemp1/file/11276278765.pdfIn PDF document text
    • http://webinaris.biz/ckfinder/userfiles/publics/files/16871934046.pdfIn PDF document text
    • https://yodishit.com/uploads/userfiles/file/sotewifibomidoji.pdfIn PDF document text
    • https://www.alertgy.com/wp-content/plugins/super-forms/uploads/php/files/3ef27a93e029befbca92b0b3d16cc91f/xukuranelolovuforonalu.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5b675a5de---54131320270.pdfIn PDF document text
    • http://acpiindia.com/userfiles/file/zunoriwusepazizoguzurezu.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_off0000bbf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBF1 10780 bytes
SHA-256: 1807ec44da0d202769ed09202ae922bbc68de3e94c1ae0b49d9a616e7d691f1e
font_01_sfnt_off0000d493.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD493 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 19652 bytes
SHA-256: 36e41ad245e82c22d7384f5e3395955ba44556799a85258e9078608b5e8d530c