Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b959e98d8bf36bf…

MALICIOUS

PDF

82.7 KB Created: 2021-06-03 05:52:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4881fb4f54bd5f64c9cddaca792340ae SHA-1: 4138278ad9bddc6890775e6a3f4268f6bcc372fc SHA-256: 7b959e98d8bf36bf18d7f942d3162552c62129a621e174c49b61452c397928ac
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one heuristic specifically identifying it as a 'PDF SEO Link Farm'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URL points to a domain that appears to be part of a link farm, and another linked PDF from a similar domain is also present.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-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://zajinet.ru/wb?keyword=what%20does%20a%20client%20care%20coordinator%20do
    • https://static.s123-cdn-static.com/uploads/4458616/normal_600897d6637a8.pdf
    • https://static.s123-cdn-static.com/uploads/4502464/normal_5ff36e446a081.pdf
    • https://cdn-cms.f-static.net/uploads/4365653/normal_606e327921b4b.pdf
    • https://cdn-cms.f-static.net/uploads/4408984/normal_6028081c6f9da.pdf
    • https://cdn-cms.f-static.net/uploads/4403429/normal_5fe666002ec06.pdf
    • https://xanugobolenaz.weebly.com/uploads/1/3/4/3/134371028/vefeni.pdf
    • https://kewalagaxed.weebly.com/uploads/1/3/4/8/134864879/xuvegaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/3fc63329-69e0-4376-a54d-87f1e1f2743d/sojujiripalowizimu.pdf
    • https://uploads.strikinglycdn.com/files/61c21be6-6ffd-4fe5-982a-9e715b105995/holmes_air_purifier_ionizer_manual.pdf
    • http://pajinap.pbworks.com/w/file/fetch/144497127/67320900633.pdf
    • https://uploads.strikinglycdn.com/files/ba51e5ca-598b-4d02-a08e-b0d73f3d62c9/20944250568.pdf
    • http://sajateves.pbworks.com/f/basic_audio_amplifier_circuit_diagram.pdf
    • https://uploads.strikinglycdn.com/files/9c787947-2cd5-4883-841a-f6350463f1c7/jasamazanekodenanusawato.pdf
    • https://uploads.strikinglycdn.com/files/9f2587c9-5d2d-4fab-b8b6-db918a480de7/blueant_s4_manual_espaol.pdf
    • https://uploads.strikinglycdn.com/files/3f9f135e-9163-4c5e-be4c-5525365a8345/sixixiba.pdf
    • http://pagorevet.pbworks.com/w/file/fetch/144443292/7199687298.pdf
    • http://tebejeloxid.pbworks.com/f/xudifemulofewasudik.pdf
    • https://uploads.strikinglycdn.com/files/2e56c50a-7f69-461d-84b2-e7e5a300e8a4/mubukunij.pdf
    • http://natutaliva.pbworks.com/f/zepasesetivupezojazurorun.pdf
    • http://figuduvimeti.pbworks.com/f/food_cost_control_formula.pdf
    • http://bukafag.pbworks.com/f/zutarupipikidifej.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000efbb.bin
77b372003389fb3c4db75e25d4afde743dc2d6dd0e90a0c0e71deb358c1f162e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 5040 bytes
font_01_sfnt_off000100e3.bin
63388f45a830a1d2e8ce5754a67f4e478be9300efa20941e6f5642559cfc05e0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E3 11384 bytes
font_02_sfnt_off000127e5.bin
68eef4b610644b6a98f668349b58b424e8310755c20c018328a8321db0e17a89		 pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 16232 bytes

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