Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d77ad3ad07155f9…

MALICIOUS

PDF

86.0 KB Created: 2021-09-09 07:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a135b415fd4692a8b1d36a8eacabfcff SHA-1: 86d9457f55f80a81ec83797ac26b21f45f4eb747 SHA-256: 9d77ad3ad07155f9705e5728c4ca9f46a37de44f81c84d3a2ca4f5814e9078f3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs pointing to disposable domains, suggesting a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a tactic to distribute malicious links across many low-reputation hosts. While no scripts were explicitly extracted, the nature of the PDF and its embedded links strongly suggests it's a lure for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://listapp.in/ci/userfiles/files/5346372944.pdf In PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pilibefekotedimisudufofi.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210907_185239.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/najenamagifapigoga.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/1613313cababb0---kopugudiroroga.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f9b3b2645a---25781123165.pdfIn PDF document text
    • http://furniture83.com/upload/files/zipevizotosalitoxojemafo.pdfIn PDF document text
    • http://meandnetworking.com/ckfinder/userfiles/files/73364855154.pdfIn PDF document text
    • http://sabancilojistik.com/userfiles/file/pikijilegegol.pdfIn PDF document text
    • https://usgcambodia.com/userfiles/file/89681667233.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/segapasezovat.pdfIn PDF document text
    • https://badanie-wody.pl/galeria/file/9208839567.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/sonarowegog.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/12994399369.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/tofinase.pdfIn PDF document text
    • http://cyc.cz/pictures/clanky/files/61880078060.pdfIn PDF document text
    • https://losungversorger.com/product/file/31214243294.pdfIn PDF document text
    • https://bem-sa.com/img/file/3285547270.pdfIn PDF document text
    • http://vitacanes.com/uploads/files/jokilujitelixubulagebaw.pdfIn PDF document text
    • http://yoga-privates.com/yoga-privates/file/marowuzafukadigevajaruta.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/40429305291.pdfIn PDF document text
    • https://www.jdconstinc.com/ckfinder/userfiles/files/34151514263.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/rijititijek.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///lomavisosulagopovavijeror.pdfIn PDF document text
    • http://abwnickersonplaza.com/uploads/files/89102682780.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=marie+kondo+ebook+free+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_off0000ea23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001023a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1023A 10392 bytes
SHA-256: 916edcfce14490a0c6539a8d1ffae76a0b2b639839fc3b4d2a8f3675a29c4309
font_02_sfnt_off000119db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119DB 18544 bytes
SHA-256: 366b1f658fd5106a45121d195f9ec6d6a828f617a8319d52744aa1b64260d075