Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c943fb96fc312ce…

MALICIOUS

PDF

81.0 KB Created: 2021-02-13 12:24:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-13
MD5: 9661f2df4ea770096d1735ec1256afd0 SHA-1: 968be88f9741254c913d6d74409302899fc9441a SHA-256: 4c943fb96fc312ce6fe94b942f5082db4239d3839c26fe17d7c472077eee1f65
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. It contains a large number of external links, suggesting a link farm or a method to distribute further malicious content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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://seumenha.ru/wix?keyword=fake+gps+go+pro+apk+download PDF link annotation
    • https://cdn.sqhk.co/filemowa/ggLSKWl/54748559003.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/3hhhhgv/etisalat_business_center_dubai_mall.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/34f303b25e.pdfIn PDF document text
    • https://cdn.sqhk.co/vozevadijut/jjhjgqY/togoxifovixej.pdfIn PDF document text
    • https://cdn.sqhk.co/numovasovev/c1Yz6gc/horizon_credit_union_locations_spokane_wa.pdfIn PDF document text
    • https://gujowidupisume.weebly.com/uploads/1/3/4/1/134131448/3ed8738.pdfIn PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/1545303.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zawuzujuw.epizy.com/vigimififabaweti.pdfIn PDF document text
    • http://bimibukiju.rf.gd/3107223519.pdfIn PDF document text
    • http://kesobiw.rf.gd/identification_of_pathogenic_fungi_campbell.pdfIn PDF document text
    • http://tafujeloraxofo.epizy.com/examples_of_iso_9001_non_conformance.pdfIn PDF document text
    • https://s3.amazonaws.com/jevelel/37876710464.pdfIn PDF document text
    • https://s3.amazonaws.com/dumupa/czardas_piano_accompaniment_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/44624730045.pdfIn PDF document text
    • https://s3.amazonaws.com/zamemigojat/tesenufudo.pdfIn PDF document text
    • https://s3.amazonaws.com/jupevuxirapi/pogutosuduraxotuso.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
    • 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_off0000eae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE6 5236 bytes
SHA-256: f303174e2e639840f079ec251e5e955261d7979ae08787534c7f441f5cce5bd1
font_01_sfnt_off0000fce0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCE0 10240 bytes
SHA-256: 41ae158acf3cec8589995c1233c6a41e6372de6ab41eb06cb675158aef6dc929
font_02_sfnt_off0001201d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201D 16660 bytes
SHA-256: 6b5fadd2f52bc1ca77e7aa2b1b7aa60fe2d97728aca7f1a06ec49f887284dfb6

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