Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d42a02b83d424b1…

MALICIOUS

PDF

86.7 KB Created: 2021-09-21 03:21:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 14501d54e27f4a9119ce753e1cb51329 SHA-1: 97f1f0ceb85a2b33b14e424565050d8e7229a61d SHA-256: 1d42a02b83d424b1ddaaf3c99964043a61c9539f2ab75f490483015dfa0ffcad
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains a large number of embedded URLs, many of which are structured as link farms or redirects, suggesting an intent to lure users to potentially malicious websites. While no scripts were explicitly extracted, the PDF structure and the nature of the URLs indicate a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://wastran.ru/uplcv?utm_term=best+android+app+for+elm327 PDF link annotation
    • https://andhimazhai.com/images/files/41491951106.pdfIn PDF document text
    • http://toonesk.com/upload/66491093469.pdfIn PDF document text
    • https://netshopnepal.com/userfiles/file/xepusoromipufiripozemafub.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16148dfaac8cda---24210192514.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/fikuxixo.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/xefomajibabajutopaf.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/51624699938.pdfIn PDF document text
    • http://tsrmmessina.it/userfiles/files/56408867349.pdfIn PDF document text
    • https://peoplehelppeople.net/uploads/File/95109532648.pdfIn PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/16396260725.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/bojizariferipetasowew.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210913040115.pdfIn PDF document text
    • https://cheesykeju.com/contents/files/dekukokafox.pdfIn PDF document text
    • http://m-s-g.ru/userfiles/files/ronefekezofodevad.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/73180442208.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/68271246755.pdfIn PDF document text
    • https://h1t-url12shio-turbo.com/contents/files/doroxefivofabi.pdfIn PDF document text
    • http://www.hausman.eu/images/wyswig_images/file/gipepugusugonuwufobor.pdfIn PDF document text
    • https://doctmcooper.com/userfiles/files/vosusunimewovuvogug.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f8ce709026---28813876679.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/56259748172.pdfIn PDF document text
    • https://fishuntpesca.it/file/66311190929.pdfIn PDF document text
    • http://nensi.si/upload/file/fefonutogemetiwoz.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_off0000ee17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE17 17368 bytes
SHA-256: 458ef31b5b16ec31912dc73be1600abdf31bddab077e799e11621d8e31eb6a9d
font_01_sfnt_off00011b3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13356 11052 bytes
SHA-256: 246f7141411a50559d8b15157ef051765bfeb6254be93b6786f1ddecfe2bcece

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