Malicious PDF — malware analysis report

Static analysis result for SHA-256 8fcd219100c82117…

MALICIOUS

PDF

73.4 KB Created: 2021-09-22 17:54:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: c7c29062266c2567b807f347931303bf SHA-1: 52005bd4c154c6c2f2ac7d9ddfb048ea09e6d897 SHA-256: 8fcd219100c82117fe73fefbe6411267f2e9d2954acad760d9c1361851cc18df
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and form a link farm, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high likelihood of malicious intent through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://kovtec.pl/eurostyl/photos/file/gaxigapugemibe.pdf In PDF document text
    • http://hoaisonland.vn/upload/files/61053495157.pdfIn PDF document text
    • https://goldmenu.com/userfiles/file/zarevokunodukibixo.pdfIn PDF document text
    • https://earthchartercities.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614b3606c7fe1---42882697739.pdfIn PDF document text
    • http://wedding-ideas.ru/ckfinder/userfiles/files/morexunif.pdfIn PDF document text
    • http://studioturina.com/userfiles/files/12153022803.pdfIn PDF document text
    • http://www.de.ruben.pl/ckfinder/userfiles/files/7283779817.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/46574275532.pdfIn PDF document text
    • http://fuzoku-kyujin.jp/ckfinder/userfiles/files/41220813274.pdfIn PDF document text
    • http://caythuocdangian.net/images/files/lusigogonumanitukimul.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210919_150323.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/38705425017.pdfIn PDF document text
    • http://nyitotthaz.hu/userfiles/files/soxirusapexewusosedoposom.pdfIn PDF document text
    • https://minlinart.com/archive/upload/files/wexidejenurere.pdfIn PDF document text
    • https://vinadesigndanang.vn/uploads/image/files/91668812469.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/21264271011.pdfIn PDF document text
    • http://simonkuehner.de/gfx/userfiles/files/7914635659.pdfIn PDF document text
    • http://ucg-eg.com/userfiles/file/89571446294.pdfIn PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/161438c4c6bc87---82620828939.pdfIn PDF document text
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/tixoxudofotasifolorer.pdfIn PDF document text
    • http://2sisaccount.com/userfiles/files/50187931695.pdfIn PDF document text
    • https://www.info-service.com.tw/plugin/ckeditor/ckfinder/userfiles/files/50526960964.pdfIn PDF document text
    • http://101balkon.ru/upload/files/xazuvaravawogujositobi.pdfIn PDF document text
    • https://hizlipin.com/calisma2/files/uploads/85301505781.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=how+to+set+app+default+on+androidPDF 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_off0000bbc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBBC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3DE 10668 bytes
SHA-256: 88d8d03d4d8efdfcf387b1fafd9eef1f3cbce08108992c04f15422577cd21688
font_02_sfnt_off0000ec6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC6F 17060 bytes
SHA-256: 54516a41040c2236c16a59c505bc08a753edd1b7e8d43c0e3ff413777ac8c1f3