Malicious PDF — malware analysis report

Static analysis result for SHA-256 41255dbf51abf064…

MALICIOUS

PDF

74.7 KB Created: 2021-09-14 07:35:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 36dda6fb44fbccad239a72f92012cff6 SHA-1: c79f07f75de2e1fafc1fe965edf0902a8f733cb0 SHA-256: 41255dbf51abf06433a3313c2c948bbbcc350aeb67c8417830e7f35090aa8532
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to a phishing campaign or the delivery of a second-stage payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 https://allytemp.ru/uplcv?utm_term=qual+o+melhor+emulador+android+para+pc PDF link annotation
    • http://quantri.thaisonpalacehotel.com/upload/files/xesufapanetitavusipo.pdfIn PDF document text
    • http://esen.life/userfiles/file/48998454933.pdfIn PDF document text
    • http://abpjse.news-read.com/upload/files/14986530286.pdfIn PDF document text
    • http://exosushi.com/uploads/files/64022402130.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1630591760.pdfIn PDF document text
    • http://indago-rovigo.it/userfiles/files/18307460508.pdfIn PDF document text
    • https://krusomying.com/data/file/61518781291.pdfIn PDF document text
    • https://sakkestadbil.no/userfiles/file/13652791253.pdfIn PDF document text
    • http://capital96.com/userfiles/file/dogolo.pdfIn PDF document text
    • http://lamelove-zakryti.cz/userfiles/file/70868232995.pdfIn PDF document text
    • https://hexema.com/FCKeditor/file/69733110777.pdfIn PDF document text
    • https://fwstc.in/userfiles/file/10831309977.pdfIn PDF document text
    • http://tc-antey.ru/uploads/files/semazuruzaximevobidofal.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613867382508d---31284130097.pdfIn PDF document text
    • http://www.pavimentosyreformasferlu.es/ckfinder/userfiles/files/bibubife.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/rijuxolidapomuze.pdfIn PDF document text
    • http://xn--80aaaghhaztbcd1agjgbccsgfftf.xn--p1ai/pict/file/xevuvaraketakitebupom.pdfIn PDF document text
    • http://snnet.kr/board_pds/fckeditor/2021/09/file/46842834471.pdfIn PDF document text
    • http://pijntherapie.be/uploads/files/53340653188.pdfIn PDF document text
    • http://billagelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/rewupimowezomoxolawepop.pdfIn PDF document text
    • https://codefon.hu/js/ckfinder/userfiles/files/vafuxalewusuni.pdfIn PDF document text
    • https://soportedevida.mx/ckfinder/userfiles/files/15422890898.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/87759726534.pdfIn PDF document text
    • http://esipro.lu/userfiles/file/polumupor.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_off0000bfd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFD6 18256 bytes
SHA-256: 654ade35e5f551e233a2a0497b24d8ad43a231337b7dc33c3c93787c842909b7
font_01_sfnt_off0000ecca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECCA 10672 bytes
SHA-256: b0eee6b5df5c827ec59a4da90c4627e834ba62df296a6cb0b0fb5da07989261f
font_02_sfnt_off00010508.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10508 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.