Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1b121549beb32ae…

MALICIOUS

PDF

74.6 KB Created: 2021-09-16 17:53:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5ad7d173625f0aa7e6487ce7bd6c8092 SHA-1: 1fd43f6479d9636929250f6614b0eb1841555b27 SHA-256: d1b121549beb32ae304baeec55b953e151c8d5babdc9dcbdf036895928eed1b0
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple external links, with one heuristic specifically identifying a link to an algorithmically-generated URL. The PDF is also flagged as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. ClamAV detection and ML classification further support its malicious nature, indicating it's likely used to redirect users to malicious sites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://saint-florentin.charcutier-traiteur.fr/ckfinder/userfiles/files/62497841890.pdf In PDF document text
    • http://schokoladenbrunnen.de/idata/ruzonawovav.pdfIn PDF document text
    • http://radiosalsa.fr/php/rs/filesupload/file/34435692582.pdfIn PDF document text
    • http://tsradviseurs.nl/mailing/images/photo/file/31909128658.pdfIn PDF document text
    • http://bioaec.com/userfiles/files/6168541631.pdfIn PDF document text
    • https://chambres-lannion.fr/userfiles/file/wivivakogaxura.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/tomin.pdfIn PDF document text
    • https://attackworkoutprogram.com/app/webroot/files/ckfinder/userfiles/files/47115168457.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/66978619168.pdfIn PDF document text
    • http://www.sana-anong.com/ckeditor/ckfinder/userfiles2/files/20587637328.pdfIn PDF document text
    • http://xn--80aesyq.xn--p1acf/files/file/73208266136.pdfIn PDF document text
    • http://pxmonastery.org/CKEdit/upload/files/mutofinebugufuvikenodiki.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/doxanopo.pdfIn PDF document text
    • http://jezirka-biobazeny.cz/UserFiles/File/2444556847.pdfIn PDF document text
    • http://pro-roubenky.cz/UserFiles/File/70642706886.pdfIn PDF document text
    • http://sinproval.it/userfiles/files/jerajuxuwimumato.pdfIn PDF document text
    • http://dc-07b6a75bc4d0.breakthrough-physical-therapy.com/userfiles/files/guwixigone.pdfIn PDF document text
    • http://thrifty-uy.com/files/others/tiduzazenitetesapupesira.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/revovapipuwomeru.pdfIn PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/16132b3a75bf4b---3734777850.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/15555513901.pdfIn PDF document text
    • http://karpatskiles.ru/store/file/39676653996.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/84685522614.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/morudozokunizaz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=snaptube+apk+pro+downloadPDF 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_off0000c0c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0C2 16896 bytes
SHA-256: 2a30b9d79c3df1e0123f3fc49ebd0a01f4d2652f999d62957d979f15e17bdf79
font_01_sfnt_off0000ec60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 10620 bytes
SHA-256: 4ad131131288d102c2f35a8808ac081eeded2a7f75cecbd1f084913b6f9ee57b