Malicious PDF — malware analysis report

Static analysis result for SHA-256 973dc13232882a1c…

MALICIOUS

PDF

70.4 KB Created: 2021-09-26 21:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f7892b0e78939a98e5c449c039b7a366 SHA-1: 924c665c2cfec7d69bc0eb3a54db60f40db73e4e SHA-256: 973dc13232882a1cdc956211adc2bec5e21fc2dffa6f45288148f3ec947fe4fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains or are part of link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://huntic.ru/uplcv?utm_term=the+running+man+michael+gerard+bauer+pdf PDF link annotation
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/161416932446db---64772401329.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/xulowipejutezopakowafosal.pdfIn PDF document text
    • http://xn--80aafbladvtgxneccoge3bt.xn--p1ai/pict/file/63985352123.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147db742e0b3---58536562528.pdfIn PDF document text
    • http://acupunctuuryao.nl/ckfinder/userfiles/files/nefakomameraziwego.pdfIn PDF document text
    • http://aeklaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/fopevupor.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/riwowomejubolerog.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/55954569489.pdfIn PDF document text
    • http://tcyy88.com/userfiles/file/2021090808053173499.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/kakitetotutomivupezunid.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/fopuwuponenirezemaxes.pdfIn PDF document text
    • http://motocams.cz/ckfinder/userfiles/files/tinojakaxew.pdfIn PDF document text
    • http://sensitiva.fi/UserFiles/File/50572317126.pdfIn PDF document text
    • https://jackyrouxmethode.com/userfiles/file/mirefojino.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/72437973610.pdfIn PDF document text
    • https://sin-wa.tw/app/webroot/userfiles/files/zuniriwovixosulifuxofowop.pdfIn PDF document text
    • http://ahjygjg.com/upload_fck/file/2021-9-1/20210901170123785964.pdfIn PDF document text
    • http://mentor-tutor.com/newGroserLikeProject/uploads/files/zibivin.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/59701209295.pdfIn PDF document text
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/dexalisifizamanewupobeku.pdfIn PDF document text
    • http://zvaracskaskola.eu/editor_uploads/system/files/sevefutanojariloxerevajaw.pdfIn PDF document text
    • http://canadianrockies.ca/files/file/49376449137.pdfIn PDF document text
    • https://nhahangphongcanh.com/uploads/files/9062363635.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/28994835643.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/kejake.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_off0000b1ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C5 10884 bytes
SHA-256: 64d9b7b4666b046e54afc3f08d860c97b8d3de1e834a1d62e9e6df3b39eb9fe8
font_02_sfnt_off0000e22e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22E 16696 bytes
SHA-256: 1336159c9fe3fbf4d023903c20abf5fd2add8e17ca7ce71cb630b49e3e6189da