Malicious PDF — malware analysis report

Static analysis result for SHA-256 d36d40abe731fe4e…

MALICIOUS

PDF

70.8 KB Created: 2021-09-25 08:46:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: bc72f1ae6343463a699e56509f04b1d7 SHA-1: a92c68800c355c2b2209c8e54405acab89d79988 SHA-256: d36d40abe731fe4ed66af609328e03902326bb9074db4edb512a46222a2eac1c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting or link farms, suggesting a phishing or redirection scheme. The presence of external URIs and the overall structure point towards an attempt to direct users to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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 http://2018.letnifestiwal.pl/ckfinder/userfiles/files/volugafulevug.pdf In PDF document text
    • https://ccar.host168.com/data/fckeditor/files/78486739133.pdfIn PDF document text
    • https://rts-wm.com/ckfinder/userfiles/files/jetireluzuvutafedisi.pdfIn PDF document text
    • http://seghers.kr/data/editor/file/1130329478614477a30033a.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-21/20210921055910239808.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/norog.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/41615928701.pdfIn PDF document text
    • http://biosite.ru/images/news/file/kozowutakurikazezenuremin.pdfIn PDF document text
    • http://sintellect.ru/Repository/file/26823807397.pdfIn PDF document text
    • https://ou-ravda.com/ckfinder/userfiles/files/zepusadazesojigamufij.pdfIn PDF document text
    • https://portalkucharski.pl/app/webroot/media/files/pipinawujosivezida.pdfIn PDF document text
    • http://charivne.info/images/file/56396474816.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/30882336356.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/99142643065.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/9246737925.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/57593537590.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/sezekirivowun.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/73018486267.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/18853679392.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/tixito.pdfIn PDF document text
    • http://temple.mo/userfiles/file/9643343883.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/72260853694.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/79777668294.pdfIn PDF document text
    • http://www.radiopopiatej.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138d2e55881e---73398144321.pdfIn PDF document text
    • http://anton-joyeros.shopcloud.es/ckfinder/userfiles/files/5958876771.pdfIn PDF document text
    • http://freehajjandumrah.com/admin/admin/uploadfiles/file/tilavaparukisipotobujik.pdfIn PDF document text
    • http://huseyindurmuslar.com/images_upload/files/xedox.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=evil+lands+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_off0000b350.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB350 10048 bytes
SHA-256: 9af2f715b1f22bcef0024012995e2f69021af3f4dd80da636662d378ee658c40
font_01_sfnt_off0000c9b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9B3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1C5 17280 bytes
SHA-256: 69311385629156fc1fbcceb9ce0d5b8cccb30fb5f6d1a26212bedd958d0a1651