Malicious PDF — malware analysis report

Static analysis result for SHA-256 152aa2ddc455c787…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 15:09:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c03a3be0030fdb706a539a8c392a6715 SHA-1: fefc10af4613388da109b8ae257e25dedc461c2b SHA-256: 152aa2ddc455c78790c928c8abb7af499305d4e01811a23e55d109c12f0c0d98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains numerous embedded URLs, many of which point to disposable hosting and are structured as a link farm, suggesting a phishing or malware distribution scheme. The presence of external URIs and the overall structure indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://laborke.ru/uplcv?utm_term=how+to+change+the+language+on+android+phone PDF link annotation
    • http://vitali-schulz-eiskunstlaufen.de/userfiles/files/61189891001.pdfIn PDF document text
    • http://pwmtqatar.net/userfiles/file/tifozolavirinesujajovaw.pdfIn PDF document text
    • http://samafb.org/uploadfilefiles/36577422258.pdfIn PDF document text
    • http://orthodoxnews.us/file/95012300853.pdfIn PDF document text
    • http://kramor.bg/userfiles/file/bikagodorori.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/85957358571.pdfIn PDF document text
    • http://cansuyu.org/resimler/files/pegude.pdfIn PDF document text
    • http://diysmart.net/userfiles/file/xidusa.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/20325559636.pdfIn PDF document text
    • https://livbiopharma.com/userfiles/file/supewivonoxofovaz.pdfIn PDF document text
    • https://uslugiinzynierskie.eu/eurostyl/photos/file/31564265900.pdfIn PDF document text
    • https://nuevocoach.co.uk/wp-content/plugins/super-forms/uploads/php/files/f89db18b643e63eded8565587e90a1a0/panuxubev.pdfIn PDF document text
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gokewezuwan.pdfIn PDF document text
    • https://exam10.menapoint.com/app/webroot/upload/files/gijakebewefal.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/66261755604.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/tegigelofekipuridarenu.pdfIn PDF document text
    • https://songod.vn/uploads/image/files/buravifegugaxijevujidokad.pdfIn PDF document text
    • http://skncn.com/u/files/xatomo.pdfIn PDF document text
    • http://lideparts.com/userfiles/file/1630632370.pdfIn PDF document text
    • http://373113.linker.tw/files/5671302398.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/19026395682.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/36510349571.pdfIn PDF document text
    • https://businesslife.com/content/files/pupuxa.pdfIn PDF document text
    • http://www.morrisjones.co.uk/EditorImages/file/bezofujukusudofe.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_off0000e0ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f900.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF900 18596 bytes
SHA-256: e6d331256576d45f6a6ea5db7768f8c90e765d1228dce5b0422031e42626a0b2
font_02_sfnt_off00012926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12926 10804 bytes
SHA-256: 0e62fe09a6ee082fa0be55e6f1767b6d224e4430bf425ed39a05c7e5cb37cc27

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