Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e4aaa34eb2339e5…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 21:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5d7f54a48f5b9d1ad4ba1b6860530b47 SHA-1: a1147ad751b861f3a0098ac01aa7c5d187063e63 SHA-256: 6e4aaa34eb2339e54fd83ec08b1c6559f739566e184e2986d4d242d0259127e6
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://philabc.ru/uplcv?utm_term=gazi+tv+news+today PDF link annotation
    • http://esoftland.com/userfiles/file/jaruxejizidadapejoxataden.pdfIn PDF document text
    • https://rtvpuls.com/ckfinder/userfiles/files/domifudiwilokavijej.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/78336409617.pdfIn PDF document text
    • http://kbcsisa.com/upload/fckeditor/file/51415801436.pdfIn PDF document text
    • http://schokoladenfontaene.de/idata/tebanekinuwir.pdfIn PDF document text
    • http://yousefmaktabi.com/ckfinder/userfiles/files/lupaxedamotuv.pdfIn PDF document text
    • https://z87992961.com/upload/files/20210915163013.pdfIn PDF document text
    • https://genia-groupe.fr/images/files/90992274636.pdfIn PDF document text
    • http://www.loicadesacavem.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16130b1d064776---31762688005.pdfIn PDF document text
    • http://giasuthienphuc.com/Images_upload/files/jusijomelevovuvofarofo.pdfIn PDF document text
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/5d29fe671542d35350752a7fc1f3226e/pabegepujebowijezatedij.pdfIn PDF document text
    • http://artospace.com/pics/file/32930385989.pdfIn PDF document text
    • http://qwerty.pl/_data/file/34760758453.pdfIn PDF document text
    • http://pension-erlkoenig.de/img/editor/file/pilopalutivi.pdfIn PDF document text
    • http://kapalishakti.com/ckfinder/userfiles/files/4858834520.pdfIn PDF document text
    • https://manage4.realtourvision.com/rtv/ckfinder/userfiles/images/files/negizolupalizem.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/56368155098.pdfIn PDF document text
    • https://izometal.net/mm/file/rezimug.pdfIn PDF document text
    • https://lidiyageorgieva.com/ckfinder/userfiles/files/mozekijukifovigax.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/riwabi.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/75816572630.pdfIn PDF document text
    • http://bienbao.org/uploads/files/ridisapewebuditawazogil.pdfIn PDF document text
    • http://dieutrimun.myphamkangnam.vn/webroot/img/files/jufipinov.pdfIn PDF document text
    • http://xinyuemu.net/assets/202109/files/20210910030353595966.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_off0000c962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC962 16812 bytes
SHA-256: d56a0c566f7c6776e1a6128f9e572d75c3ad480724b3ba8e48cdccf417158e76
font_01_sfnt_off0000f4f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 10460 bytes
SHA-256: ea43275285ef635e57c9b62ce1f1a284cb039cdf8c48c34a2b7ac9bef73b43e8