Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea83bba2c458296c…

MALICIOUS

PDF

80.8 KB Created: 2021-09-16 01:20:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 61b5c8b320d20dd514c02f64653b6da9 SHA-1: 6143d7fceac22a18be5499a2232144af5f301095 SHA-256: ea83bba2c458296c804ff4fd0be6f116035a1da7d0c04f0157c97872f0c479c9
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 trojan. It contains a large number of embedded URLs, many pointing to disposable domains, indicative of a link farm designed to obscure malicious destinations. While no scripts were explicitly extracted, the PDF structure and heuristic firings suggest an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://leicht-spb.ru/wp-content/plugins/super-forms/uploads/php/files/e3552394f6c489e3ac0afa368b763a4e/87187757676.pdf In PDF document text
    • http://jshtextile.com/UserFiles/file///nuvobibaturamivudubivi.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/41249132730.pdfIn PDF document text
    • http://pop-around.com/file_media/file_image/file/jijexelef.pdfIn PDF document text
    • http://recuva.kr/upload/fck_img/1630755148/file/weminipap.pdfIn PDF document text
    • http://vswet.ru/f/jopokofoxonijukepabiwepip.pdfIn PDF document text
    • https://techielingo.com/fck_uploads/files/jegigikolebemaxigij.pdfIn PDF document text
    • https://webrobogo.hu/kepek/20829290237.pdfIn PDF document text
    • http://eis-pieschel.de/UserFiles/File/subokomosojanafiduvav.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/93072601769.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/jigemajodukuvov.pdfIn PDF document text
    • https://interno-kazan.ru/upload/files/99906365526.pdfIn PDF document text
    • http://www.psoealora.es/ckfinder/userfiles/files/27824086294.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/gotogoxerupusub.pdfIn PDF document text
    • http://mylivediamondinventory.com/uploads/files/86840128253.pdfIn PDF document text
    • https://cryptoshift.be/anaeter_capital/siteadmin/userfiles/files/52059434491.pdfIn PDF document text
    • https://djecijagarderoba.me/userfiles/file/12094184851.pdfIn PDF document text
    • http://saiprogetti.net/userfiles/files/19326710427.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/tuvebenosajivujedoz.pdfIn PDF document text
    • http://fteq.ru/files/file/41204849519.pdfIn PDF document text
    • https://cafepiolho.com/uploads/assets/pikurewiwafelor.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/zuzurim.pdfIn PDF document text
    • http://webbuilders.com/files/file/56044847069.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ab3e73da6f---pawedubite.pdfIn PDF document text
    • http://chronocertif.com/userfiles/file/mapukemobubutogegos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=bloquer+numero+androidPDF 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_off0000d658.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD658 19564 bytes
SHA-256: 168d936b7ae21093098924a0db73ba226c142bad9f0a77967f41700aabc159cc
font_01_sfnt_off0001066d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1066D 10444 bytes
SHA-256: 965e0d64fce978b8e474c3740e1782bdf5c32e07fe952f3ebdfcb1fc05cb41c6
font_02_sfnt_off00011dcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1