Malicious PDF — malware analysis report

Static analysis result for SHA-256 b104abec0f1f87fc…

MALICIOUS

PDF

96.3 KB Created: 2021-09-23 11:25:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: ab9fdf4a4bb206a6cb94703e33939328 SHA-1: 7f229ae3210b94efde46dacf386ef89a107a97ea SHA-256: b104abec0f1f87fc5cd48450d3ceae0f0e9c04fe5ce83048274a456a573ab80e
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. The document body is heavily obfuscated, but the presence of numerous links to disposable domains and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a link farm designed to host malicious files. The primary goal appears to be directing users to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

Heuristics 5

  • 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.
  • 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://gesema.com/UserFiles/file/xiluzanakitivaz.pdf In PDF document text
    • http://lex.tj/img/file/povezuwezemerijibokepuba.pdfIn PDF document text
    • http://www.alexgis.com/siteuploads/editorimg/file/gojusepawoxafosegugalivef.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/wipirumafuboribowekakovus.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/44434984799.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/f2bd3157c0b8f387a0a88402ec9b69cf/50064214197.pdfIn PDF document text
    • https://pluviaterra.mx/wp-content/plugins/super-forms/uploads/php/files/720c0bb7b674424d21a6e0f9d6765b55/vijugogifuwevovefibi.pdfIn PDF document text
    • http://peoplefoster.com/pliki/nifumikezituxina.pdfIn PDF document text
    • http://obasekiestates.com/UserFiles/file/sirogidazofitiwijo.pdfIn PDF document text
    • http://gamax-motor.cz/data/dokumenty/vazozokubideduj.pdfIn PDF document text
    • http://lukasikgroup.pl/Image/files/xisonakun.pdfIn PDF document text
    • http://fmafirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kogodikepapive.pdfIn PDF document text
    • http://denge.aero/upload/files/xitine.pdfIn PDF document text
    • https://gamedunyasi.com/calisma2/files/uploads/21046764066.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/60450871409.pdfIn PDF document text
    • http://jimsclub.net/new/board/img_tinfo/file/20210920120112.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/wezowujebofewuv.pdfIn PDF document text
    • http://bronia.org/userfiles/file/fukodenore.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/63061919720.pdfIn PDF document text
    • http://www.szphotar.com/admin/img/files/tebebol.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/62536531537.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/7623944685.pdfIn PDF document text
    • https://marmetal.cevhertemizlik.com/userfiles/files/74963089192.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=percy+jackson+books+online+download+freePDF 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_off000112fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112FA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B11 10932 bytes
SHA-256: 79dcca0cde3b04ef1456ac4de766a82fda3cbb7d93b984bb89c0dcf07d9dd804
font_02_sfnt_off00014489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14489 17948 bytes
SHA-256: ddcb2d00a289012136cd729d5bd1cfef1c5dc1bd59902966b6b1bc1a1a2d192c