Malicious PDF — malware analysis report

Static analysis result for SHA-256 be5d37ccf0cc74c2…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 13:16:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45a928806ee7b4beedcdb85cb082e5e9 SHA-1: 95f0ebfa2395b1080ef7858720031a1520f1acb0 SHA-256: be5d37ccf0cc74c24b1cad438c721b402bd6302cbc8cb7df04828d96a3857f3f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to host many links on disposable domains. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest it's intended to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://mokhalasati.com/userfiles/files/wepuvajurakijemuxujowalo.pdf In PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/8327638458.pdfIn PDF document text
    • http://cl-pub.com/files/files/45936966047.pdfIn PDF document text
    • https://thuanxuongmonmb.com/admin/webroot/upload/image/files/41806844556.pdfIn PDF document text
    • http://officinedesign.it/userfiles/files/18128672184.pdfIn PDF document text
    • http://dogable.de/userfiles/file/82216795945.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/83553322777.pdfIn PDF document text
    • https://sealand-pptc.com/userfiles/file/zikavadape.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/gedajisoxitebimavusixedeg.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613cf1624c329---vabobexekukilijogirep.pdfIn PDF document text
    • http://porpora.group/imagenes/imagenes_contenidos///riwatunow.pdfIn PDF document text
    • https://behagi.eus/files/galeria/files/78963470052.pdfIn PDF document text
    • http://noticiascgnews.com.br/ckfinder/userfiles/files/51825716620.pdfIn PDF document text
    • https://actsonics.com/uploads/files/202109020807483705.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/xuxasedobizifamuna.pdfIn PDF document text
    • https://kmkmekanik.com/upload/ckfinder/files/54195610442.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/gepejakoba.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/lepevapagugajenunipuw.pdfIn PDF document text
    • https://valerart.com/ckfinder/userfiles/files/86643116119.pdfIn PDF document text
    • https://on-call-anatomist.org/ckfinder/userfiles/files/48502696997.pdfIn PDF document text
    • https://www.dooleysnaturalgas.com/ckfinder/userfiles/files/876481111.pdfIn PDF document text
    • http://villapellegrino.it/userfiles/files/kikevazojoxelif.pdfIn PDF document text
    • http://www.gpe-el.pro/ckfinder/userfiles/files/27607099450.pdfIn PDF document text
    • http://erisalaw-chicago.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/1161224549.pdfIn PDF document text
    • http://afslab.asia/upload/files/fupeperekokitawe.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/448de7de2bb07c8c6bdf9fada1b5aa99/53693625923.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=vidmate+lama+mp3+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_off0000d5ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5ED 17968 bytes
SHA-256: 9aebb69d44e53c7a2df187939e31247dac4219003cbcda48a19c33fc84d33099
font_01_sfnt_off000104fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104FE 10512 bytes
SHA-256: a8ae06a51c7f6bdbe69c26e548dc2a4418827bb0566d067743e1efad48c08a10
font_02_sfnt_off00011ced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1