Malicious PDF — malware analysis report

Static analysis result for SHA-256 578b6f3d7a1adb98…

MALICIOUS

PDF

63.8 KB Created: 2021-02-15 00:35:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: c3d1f372c1e0ab3d849990992a9faedb SHA-1: ebb1957a26a909aafd09720d2483d729684d0e89 SHA-256: 578b6f3d7a1adb980653d25661fb052d4e4a11265a9ab59a881c69b421055129
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm. One of the primary links points to a PDF hosted on weebly.com, which is part of a larger pattern of SEO-optimized PDF links. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or distributing further malware. No scripts were extracted, but the structure suggests a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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/aws?utm_term=crash+course+government+and+politics%2523+4+answers PDF link annotation
    • https://vugawijop.weebly.com/uploads/1/3/4/5/134594760/46df9a5.pdfIn PDF document text
    • https://feposejixadolo.weebly.com/uploads/1/3/4/7/134744373/javenufuve-tubipiz-nobagidevirimu.pdfIn PDF document text
    • https://filukekab.weebly.com/uploads/1/3/4/4/134478490/301f980.pdfIn PDF document text
    • https://cdn.sqhk.co/bamazaludez/eD4jeS6/dufejowikesudevevuwolo.pdfIn PDF document text
    • https://cdn.sqhk.co/pirujezexod/rhjRoUT/street_basketball_association.pdfIn PDF document text
    • https://xonasuxodu.weebly.com/uploads/1/3/2/6/132681295/januxazileropo-juleb-pibowebagi.pdfIn PDF document text
    • https://zasazijubafal.weebly.com/uploads/1/3/5/2/135299125/dusaferedupoxitip.pdfIn PDF document text
    • https://zelelifejoba.weebly.com/uploads/1/3/4/3/134321633/notixesoledijasu.pdfIn PDF document text
    • https://muzuxagofonokow.weebly.com/uploads/1/3/1/4/131406885/4354302.pdfIn PDF document text
    • https://xofezariro.weebly.com/uploads/1/3/1/8/131871505/8175ab9015f7.pdfIn PDF document text
    • https://wivoximuvekobug.weebly.com/uploads/1/3/4/4/134473281/rikux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/titugome/presentation_software_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/68165370319.pdfIn PDF document text
    • https://s3.amazonaws.com/bomupi/65569514075.pdfIn PDF document text
    • https://s3.amazonaws.com/gapuruxumeg/dekozoketozepevutox.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/christmas_template_for_powerpoint_presentation.pdfIn PDF document text
    • https://s3.amazonaws.com/mikibetiv/13643360415.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/muscles_origin_insertion_action_table.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD2F 5452 bytes
SHA-256: 057b1243b5a846fa793d3daedafc8e86d121d722ad0665ef03b38d41fc58db92
font_01_sfnt_off0000cf93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF93 10040 bytes
SHA-256: bc67795e9b4277aa3301c9b96fb4dc05f5b368cddfa3f7cf2f2444d3c3da3b06

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