Malicious PDF — malware analysis report

Static analysis result for SHA-256 9320fb0399f4df4d…

MALICIOUS

PDF

85.8 KB Created: 2021-05-04 01:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 901bc10e76727f074561e2dd66ce7770 SHA-1: c86ae364131afac3af7a5562effd8f474be9515a SHA-256: 9320fb0399f4df4da70a18e39113538b01e034ddca27a4bc381b6ae3193d599f
136 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a lure referencing 'The tattooist of Auschwitz summary chapter 1' and includes a high-risk heuristic for an SEO redirector link. This link, https://seumenha.ru/strik?utm_term=the+tattooist+of+auschwitz+summary+chapter+1, likely leads to a phishing page. ClamAV also detected this file as Pdf.Phishing.Trojan. The embedded content is heavily obfuscated and does not contain directly executable scripts, but the overall structure and heuristics strongly indicate a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://seumenha.ru/strik?utm_term=the+tattooist+of+auschwitz+summary+chapter+1 PDF link annotation
    • http://wujasonuvilo.mywebcommunity.org/8879811902.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419626/normal_60262757064db.pdfIn PDF document text
    • http://zaranes.getenjoyment.net/71019135633.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481515/normal_600075b225d2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476420/normal_600377d47bae2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470681/normal_5ff5f69ba26d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_5fd7b8379242d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/e49b944e-a833-4dbd-b0fd-0593d9d76de9/53184356014.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58d5ed6-f674-4a66-b59a-67650b7c10dc/cloudy_with_achance_of_meatballs_cast_dad.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/expression_web_4_html5_templates.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8bb102f-c6bb-4429-946c-9aba3c6230a6/what_do_the_number_30_mean_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28d230d6-0546-41c0-9d84-87df720d1c45/95184999029.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3dfcb99d-b59b-444d-9db4-a6ee3adac6c2/black_and_decker_cordless_drill_20v.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae30303a-5c96-4a18-8201-2adea055a42d/traitement_du_trouble_obsessionnel_compulsif.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d99ed921-06b9-42ad-aa3c-274b032f3533/dixozineg.pdfIn PDF document text
    • https://s3.amazonaws.com/jotizifime/cbse_improvement_exam_2018_date_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibudasagas/feature_update_windows_10_version_1809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a3dfa75-8a41-4a13-ac46-b1ed3753fd85/gobaxaxusetelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9977537d-3d5f-41c8-8b44-b73acd60048d/what_is_philosophy_of_teaching.pdfIn PDF document text
    • 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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ffd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD6 6548 bytes
SHA-256: 370b63e99b3bc2c1d8b7a2bfc1693e0257dccade0e64e814f912f9e1c3af29e8
font_01_sfnt_off0001102c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1102C 5468 bytes
SHA-256: d222088ec69e2b15b8b9ab45e475971d62701bfff1a72e5356e1839e40b7ee75
font_02_sfnt_off000122c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122C0 10992 bytes
SHA-256: 3b94f2c3795b9694006979a0a38a313a0633f9b3fd4281ce7ee90021e6013011