Malicious PDF — malware analysis report

Static analysis result for SHA-256 644fafa318248a14…

MALICIOUS

PDF

69.9 KB Created: 2021-10-04 00:05:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: b6e2c603b361789109822e47ce6e0374 SHA-1: 143a02997252a0e01305fc18c565abfebee18ea2 SHA-256: 644fafa318248a14cd11d9e8b6911ac07e67da1f2668f7a6cf85e1ce989e34c1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. It also functions as a link farm, directing users to multiple external PDF files hosted on various domains, suggesting a distribution or SEO poisoning campaign. The presence of embedded JavaScript indicates an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395c33a73f9---7517342727.pdf In PDF document text
    • https://acp-luxusingatlanok.hu/ckfinder/userfiles/files/91508258630.pdfIn PDF document text
    • http://tehpromyar.ru/media/file/61598023970.pdfIn PDF document text
    • http://dailycan.com/userfiles/files/vawunome.pdfIn PDF document text
    • http://girlstown.org/files/js/ckfinder/userfiles/files/pujesizodenajoborusevaw.pdfIn PDF document text
    • http://imaginove.eu/data/Files/lejisepizexopewaz.pdfIn PDF document text
    • http://wami.cc/data/files/jefaroxiwugefuwadi.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202110030337442301.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/57962189493.pdfIn PDF document text
    • http://execdentalclinic.com/uploads/ckfinder/userfiles/files/7018694859.pdfIn PDF document text
    • http://yuhenganquan.com/userfiles/file/20210929103740_930263946.pdfIn PDF document text
    • http://ayurveda-shiatsu-qigong-nice.com/upload/files/tumasavudodareliwujapa.pdfIn PDF document text
    • http://creatinglifeoptions.com/userfiles/files/rojupodepixojemibaribalus.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/82562592251.pdfIn PDF document text
    • http://kencert.vn/uploads/image/files/dikanidoxezuritigunazurur.pdfIn PDF document text
    • http://flex-link.cn/uploadfiles/files/98356739607.pdfIn PDF document text
    • https://albertoangel.sinecsas.com/ckfinder/userfiles/files/59307385105.pdfIn PDF document text
    • http://avvocato-callegaro.it/public/file/98706021708.pdfIn PDF document text
    • http://genarchi.com/data/temp/file/99722643243.pdfIn PDF document text
    • http://104408017.linker.tw/files/takomubo.pdfIn PDF document text
    • http://perlawarmii.pl/userfiles/file/lobemonunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=types+of+postsecondary+educationPDF link annotation
    • 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_off0000adc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xADC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c5dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5DD 10744 bytes
SHA-256: e49c845c5ce31975ea21e52eb3171d5768e21d846baf1037ddc0ab636911f329
font_02_sfnt_off0000debe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBE 17004 bytes
SHA-256: f8f2c760062a2af23b9517e53a708e39d5d508d88d96848b6ccc23216df3204a

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