Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a3ad657db48b1c9…

MALICIOUS

PDF

111.7 KB Created: 2021-04-21 07:22:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c78c488a128ea4231c0f51de260ec538 SHA-1: d190b1aa458d5392d2eea4cd46bea089a9798df6 SHA-256: 5a3ad657db48b1c95e736756e0ffee6d21be0a3982387ac9165d34556eb25910
96 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URI that leads to a URL which, while appearing benign in isolation, is part of a larger pattern of malicious activity. The document body, though heavily obfuscated, suggests a lure related to search engine functionality, likely intended to trick the user into clicking the embedded link. No scripts were extracted, but the presence of embedded URIs and the ML/ClamAV detections strongly indicate a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.uts.cw/sites/default/files/webform/tidenopuzi.pdf In PDF document text
    • https://www.a1touchsolution.nl/sites/default/files/wozupidojenebimovom.pdfIn PDF document text
    • http://www.pacificsportfraservalley.com/sites/default/files/webform/zasadavatemomafupe.pdfIn PDF document text
    • http://www.guninetwork.org/system/files/webform/heirri_proposals/nuxikovevevugodir.pdfIn PDF document text
    • https://www.enwidth.com/sites/default/files/webform/resumes/21555212736.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/3018222411.pdfIn PDF document text
    • http://www.muttypawsacademy.com/sites/default/files/webform/vaccines/nojezajewi.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/zoxajetuvu.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/95941620813.pdfIn PDF document text
    • http://www.pbttphtk.gov.my/sites/default/files/webform/33269367294.pdfIn PDF document text
    • https://www.a1touchsolution.nl/sites/default/files/56489371510.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=how+to+reverse+google+image+search+on+macPDF link annotation
    • https://lib.asu.edu/system/files/webform/sikukuditizituxabisezopel.pdfIn PDF document text
    • https://www.vub.be/sites/vub/files/webform/gegisikirusesikogibo.pdfIn PDF document text
    • https://campusrec.princeton.edu/system/files/webform/16616798570.pdfIn PDF document text
    • https://printandmail.princeton.edu/system/files/webform/85064040694.pdfIn PDF document text
    • https://www.ice.cam.ac.uk/sites/www.ice.cam.ac.uk/files/webform/7842358922.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
    • http://scripts.sil.org/OFLIn 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000147e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147E4 5328 bytes
SHA-256: 550b9917c8ee38cbc3929eca263416f87b2fa734fb877a3e464c0919c48ab5e9
font_01_sfnt_off000159aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159AA 6340 bytes
SHA-256: 7928f6bfcacf4b8c2218b012f30d6a688f7d600c2bceec2598b03ee34226b8f3
font_02_sfnt_off00016936.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16936 1716 bytes
SHA-256: 7314a8110a688275e79cb4cd5cd058a9f858becaa7f01fde0a687197ddc85302
font_03_sfnt_off000171c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171C1 12668 bytes
SHA-256: 15fb60d9612aa26f678809245e2e7b25447ad5aa88389eb25065cddcc96ada3d
font_04_sfnt_off00019b55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19B55 16080 bytes
SHA-256: bf2bb651642035a19e1b8bf5dc55c4db7948913289cd11d1f66f0c65c0fed8c7

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