Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1de73e7f406a861…

MALICIOUS

PDF

102.6 KB Created: 2021-03-24 12:46:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5262ecfd8eaa595891de420dd86ca76 SHA-1: a3409340120b24feeaf016b895c486971e7175fb SHA-256: e1de73e7f406a86147cda8d607de0e9e104753574e8bc6166c7c0d07dc2a74ee
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO farms or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were directly extracted, the PDF structure and embedded URIs suggest an attempt to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/wix?keyword=sweden+grammar+pdf
    • http://funasowuto.getenjoyment.net/30398465698.pdf
    • http://zozamowewideno.mypressonline.com/90674181620.pdf
    • http://jabewes.medianewsonline.com/adobe_illustrator_tutorials_in_tamil.pdf
    • http://raraveluwogevuw.mypressonline.com/95248881590.pdf
    • http://folejaf.mypressonline.com/kemipovumetusapopepuw.pdf
    • http://fojedera.22web.org/valilaxizajoxebijas.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nefunupu/grab_psv_medical_check_up_form.pdf
    • https://s3.amazonaws.com/dinigugaxej/52016883856.pdf
    • https://s3.amazonaws.com/pivetuzadujo/jidipone.pdf
    • https://3b1a0cff-dc54-4917-88c1-cdf904a8db56.filesusr.com/ugd/60aab8_ddd114eca73c4885ad64fc5a3b73380d.pdf?index=true
    • https://cc0b58a5-7bf4-4b41-9cd7-d9bc0cd2cc6f.filesusr.com/ugd/6dc98b_33413a38bc1e477cb6875c426610a06d.pdf?index=true
    • http://satawakerexe.atwebpages.com/visual_basic_code_book.pdf
    • http://zukusuvajijip.epizy.com/explain_the_three_main_differences_between_dna_and_rna.pdf
    • https://51da6a7d-ee05-4a49-87ee-1b74af3aeb07.filesusr.com/ugd/b80405_06c81f44a6064ff993b9cfa0565ad110.pdf?index=true
    • https://s3.amazonaws.com/posufij/how_to_remove_maintenance_light_on_honda_civic_2003.pdf
    • http://bamonoxo.onlinewebshop.net/30280263843.pdf
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_28aa305aca324f2f86d4ee15b416b077.pdf?index=true
    • https://746420f6-3007-491b-ba72-fd43be5094e5.filesusr.com/ugd/277b62_dadf5b27cd3e4e6c8decb972e456f257.pdf?index=true
    • http://pidodexogejax.myartsonline.com/xalupasapimoxuzozuv.pdf
    • https://4c2674ec-1430-4cec-a455-d6a35d10586e.filesusr.com/ugd/38955b_c2e30cbcb2b149beb8a879f4a7deaa41.pdf?index=true
    • http://nejetetivapane.epizy.com/31623928192.pdf
    • https://7133fc40-0b9c-4701-b953-e7fafc934b44.filesusr.com/ugd/70a38d_c13258a581684489a4e2792a4d6d7e03.pdf?index=true
    • https://43a98339-0465-49d0-a416-8cef4780896f.filesusr.com/ugd/89258f_68b90a5313194d9d953cd8835eb552f9.pdf?index=true
    • https://s3.amazonaws.com/tufujifinobiro/biology_textbook_9th_grade_california.pdf
    • http://tudulem.rf.gd/37630374050.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014ef9.bin
937293d1246b350e67ffb91abeb3ca1e6309839e54a4ef8a6f7963ccd166ece4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14EF9 5348 bytes
font_01_sfnt_off00016128.bin
8bac71462de3cbbfba711b84f73308dd4332b170de72f2402508d690f1015ae5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16128 13452 bytes

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