Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1804b3084caa8e1…

MALICIOUS

PDF

74.7 KB Created: 2021-09-13 08:12:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 2e9c1911f568d3ed7fc1d131cb102de7 SHA-1: 52c13cf067294ef90d5a1b0327b642f99c16ffe8 SHA-256: e1804b3084caa8e1ed6865ac7c61beb40e5166c0d47a5a5ba95fd35f06fb819a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous disposable domains. The presence of multiple unknown URLs strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://festivaldeliteraturadepereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/161310dceb4b2b---54355032271.pdf In PDF document text
    • http://mathrainbow.com/userfiles/file/97916376634.pdfIn PDF document text
    • http://www.bash.cl/media/file/47210666352.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-6/20210906122720535841.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/kafeboramebosagipivimi.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/75680772412.pdfIn PDF document text
    • https://www.vignolaweb.it/ckfinder/userfiles/files/gezuwesejekawoxuzesar.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/14680655969.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/kopijejebinusepimu.pdfIn PDF document text
    • https://jkmart.net/FCKFiles/File/38965030074.pdfIn PDF document text
    • https://unaizahic.com/Files/files/47979400914.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/sexosusisun.pdfIn PDF document text
    • https://xn--b8qxb801j.tw/upload/files/renawujiro.pdfIn PDF document text
    • http://inica.org/files/file///8005185490.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/beravarisudoz.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/lewoguvepanetafawifexija.pdfIn PDF document text
    • http://tunecharts.com/userfiles/file/migususi.pdfIn PDF document text
    • http://ghettaetamionarchitetti.it/userfiles/files/51330585448.pdfIn PDF document text
    • http://krukaiart.com/userfiles/files/71493364828.pdfIn PDF document text
    • http://jtg-antracyt.pl/files/file/99439072920.pdfIn PDF document text
    • https://canevastoilestjean.com/upload/editor/file/92525780369.pdfIn PDF document text
    • https://burgaseguros.com/userfiles/file/mepoxolukemif.pdfIn PDF document text
    • https://osikovo.eu/webroot/img/content/files/23824436090.pdfIn PDF document text
    • http://staractivecollection.com/resimler/site/files/81346632462.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=king+lear+oxford+edition+pdfPDF 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_off0000c1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1A5 10600 bytes
SHA-256: 3e40e5c652a110dd2ca266350338aab7ae2c4ca198d7bdde4f4ccf59955a3017
font_01_sfnt_off0000d9b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B8 16624 bytes
SHA-256: 593e24122639e42b058d2b6d8ac646731dba657d0dbaf2ee22393bee6ca53152
font_02_sfnt_off000104cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104CD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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