Malicious PDF — malware analysis report

Static analysis result for SHA-256 7632541c77a576ba…

MALICIOUS

PDF

80.6 KB Created: 2021-09-22 14:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 47948848cfb2a657d4c7e83445cacc15 SHA-1: e254661e9e15fb1105d8f9ce48d95c61363bd036 SHA-256: 7632541c77a576bab1911ce01c428921bd64d757c53d71bbc8366cd10dee34be
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to external sites, suggesting a phishing or malware distribution scheme. The PDF structure and the presence of external URIs are indicative of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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=android+mobiles+game PDF link annotation
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/7db87ec44338e949c6c3c6745ea87eae/mivuwulajafef.pdfIn PDF document text
    • http://clean-ecology.com/Upload/files/lutupewafivo.pdfIn PDF document text
    • http://about-dogs.ru/upload/file/nutaxojufe.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/nisawivupezoxedopo.pdfIn PDF document text
    • https://candica.pl/ckfinder/userfiles/files/winix.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142d665c0fb8---redaleduxikujaduvijira.pdfIn PDF document text
    • http://xn--zb0by3yusal20ak5lcidnwigi.com/ckfinder/userfiles/files/1632117388.pdfIn PDF document text
    • http://mbeautyconcept.com/upload/content_images/file/63522188673.pdfIn PDF document text
    • http://amongelite.com/ci/userfiles/files/4912317700.pdfIn PDF document text
    • https://yifff.se/userfiles/file/pinepewidav.pdfIn PDF document text
    • http://techcessgroups.com/userfiles/file/68248016552.pdfIn PDF document text
    • http://villalapinetafavignana.it/userfiles/files/20478387643.pdfIn PDF document text
    • http://tizianaiberti.it/userfiles/files/rodopaw.pdfIn PDF document text
    • http://www.painters-restaurant.com/userfiles/file/kixefalivubezinefaju.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/202191618485635.pdfIn PDF document text
    • http://sm.ac.th/ckfinder/userfiles/files/75406173968.pdfIn PDF document text
    • http://onlinetradeshow.ir/uploads/files/sijojoresabezagegapibivi.pdfIn PDF document text
    • http://anhuizhkj.com/upload_fck/file/2021-9-6/20210906014719601942.pdfIn PDF document text
    • http://kibbkw.com/uploads/file/bupunivazisibonuxera.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/2878850910.pdfIn PDF document text
    • http://paulgraphics.paulsfashion.in/files/10880772039.pdfIn PDF document text
    • http://xn--12cfu9bc1efac9a9azfdsb7b9d1f0j.net/ckfinder/userfiles/files/3827573914.pdfIn PDF document text
    • http://dlugopis.kbo.pl/ckfinder/userfiles/files/peloratuxotifapupiz.pdfIn PDF document text
    • https://hydratrend.com/application/third_party/ckfinder/userfiles/files/losapubuvimojorufawafojam.pdfIn PDF document text
    • https://infrastone.com/userfiles/files/bulunirobewubazobeko.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_off0000d742.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD742 10612 bytes
SHA-256: 2f5b36ccacc9037ab80d8fdff39e1621d741d6972667682c1a1a9d73900e4334
font_01_sfnt_off0000ef37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF37 17864 bytes
SHA-256: 5d7f51265f40db0f35c6f6b5faddcec470cee61e6f7dc3d26a55d6d5aaae5cf8
font_02_sfnt_off00011cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1