Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bfe98b0185a461f…

MALICIOUS

PDF

67.8 KB Created: 2021-09-18 03:11:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3bdbc3c10ce2106b06c48be1d85114a7 SHA-1: c4ac9dac31ae79d5fa380581bf53d9c3322cd5b3 SHA-256: 9bfe98b0185a461feac4f78a9895795a0425a232941a3f2abcab025d49c3d8c1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF exhibits characteristics of a phishing lure, specifically an image-only document with a clickable action designed to redirect users to external URLs. The presence of numerous links, many on disposable hosting, further supports this. ClamAV and ML classifiers also flagged this file as malicious, indicating a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 67 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6f826d23f---dagorunanex.pdf In PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/71203609767.pdfIn PDF document text
    • http://pillshop.ru/uimg/files/34982604810.pdfIn PDF document text
    • https://crbz.ru/userfiles/file/vinasizojozenutimasiri.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16139e981a2fdb---xugarigiberi.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/71428474943.pdfIn PDF document text
    • http://vanhacollection.com/images/files/kikarebirokupil.pdfIn PDF document text
    • http://magdrywall.com/project-new/christianbook/upload_images/file/15161208346.pdfIn PDF document text
    • https://tiklatakip.com/calisma2/files/uploads/litabeliruzokepewivexi.pdfIn PDF document text
    • https://parvazyab.com/basefile/api203/files/19461185887.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nifujipowubu.pdfIn PDF document text
    • https://kvizek.hu/ckfinder/userfiles/files/31468842190.pdfIn PDF document text
    • http://machin.kr/userData/board/file/jawiva.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/bizugavanewubuzupeju.pdfIn PDF document text
    • https://eghamatyab.com/basefile/bainbookcom/files/27505928308.pdfIn PDF document text
    • http://wingprocess.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/86196260067.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/lerekoxijoxepazesubade.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/66241202198.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/2426571865.pdfIn PDF document text
    • http://krr-nfe.com/suratnfe/UserFiles/File/30198135503.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/87523565885.pdfIn PDF document text
    • https://sca-eagleegg5k.com/ckfinder/triplebuserfiles/file/42128856113.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/xipodomapenomokasozene.pdfIn PDF document text
    • http://klawiatury-foliowe.pl/_data/file/27762890780.pdfIn PDF document text
    • https://digireg.lu/upload/lupolotuvijapile.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=priv+instagram+viewerPDF 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_off0000b094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB094 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8AB 10440 bytes
SHA-256: c10c839511a9b92e54c28f220157064b9f3cc8209b06510c26ffe1cf7c9e148d
font_02_sfnt_off0000e05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE05C 13676 bytes
SHA-256: 1bc7c5171705cf48023c4b45f537bf202e7f4bc0fcd7c4ccd793a19f13c6c472