Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ab8183c4f8151a7…

MALICIOUS

PDF

80.0 KB Created: 2021-09-20 14:04:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73bc539154b4cd3ce1a00706ba98c040 SHA-1: 0894299851b3ce378b0f1b0072dd63b34f1da213 SHA-256: 9ab8183c4f8151a7de9c002bb49abb3474743ad34922a787e13bd91cf0c53f01
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document flagged by ClamAV as a phishing trojan. Heuristics indicate it uses social engineering tactics (ClickFix) to prompt the user to execute a command, likely to download and run a secondary payload. The document also contains numerous embedded links, one of which points to a potentially malicious PDF hosted on sakem.org.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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 http://sakem.org/userfiles/files/namaxuwuwevi.pdf In PDF document text
    • http://www.bongbansaigon.com/uploads/files/futujizapimudavade.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9ba90ac68---dopakemarabitu.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/kovutivapoxos.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/7245198460.pdfIn PDF document text
    • http://oldstat.ww.tj/img/file/55227277113.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/jufen.pdfIn PDF document text
    • http://birdwatching.sk/media/file/lidogidanodobabilivelur.pdfIn PDF document text
    • http://planet-for-events.de/userfiles/file/papoforepewuwidizakil.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/7948358565.pdfIn PDF document text
    • http://www.hkimm.hk/_bin/ckfinder/userfiles/files/xoxepaxamelugab.pdfIn PDF document text
    • http://tsyrulnikov.ru/upload/file/97661181630.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/janomazipo.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/38032545053.pdfIn PDF document text
    • http://imobiliariaimperio.com/files/files/fuxolazuwenopeke.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9e4ce9717dcd12a9a3c5063068e06bb7/9291677400.pdfIn PDF document text
    • http://xn--80aaa6aachkjln0qra.xn--p1ai/ckfinder/userfiles/files/26151479902.pdfIn PDF document text
    • http://bankerz.in/qpic/files/zenatizu.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/98188934015.pdfIn PDF document text
    • http://accronline.com/userfiles/file/bimipejuvap.pdfIn PDF document text
    • http://nfc-lampang.com/user_img/files/5776746704.pdfIn PDF document text
    • http://france-ex.com/images/blog/file/zesagejefivizi.pdfIn PDF document text
    • http://dlzj.net/upload/files/20210906101754676203.pdfIn PDF document text
    • http://www.accl-calibration.com/login/ckfinder/userfiles/files/dibozedijapodaxo.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/bitenubalikuwedodu.pdfIn PDF document text
    • https://riminabda.sk/userfiles/file/rereloroxanibez.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+change+the+alarm+sound+on+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_off0000d340.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB52 17520 bytes
SHA-256: bcb7294a8e1e6146037c574df7f1aaf8efc2d9a41f6767bfa9d829b12e9ef3a3
font_02_sfnt_off000118e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118E2 10992 bytes
SHA-256: 7692f236d473e20c432835c74b15622ac9967655a4943f6145e32a4ac6937df5