Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d61e4e660a3430f…

MALICIOUS

PDF

74.8 KB Created: 2021-04-04 01:41:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: ce990fb9957f4572ae96d9138e809fb8 SHA-1: 23ed1847a2d6459760a5df52b9e2b5a16e791877 SHA-256: 9d61e4e660a3430fb0c9f2f04d09c40bb0e506aa0bc7e00bfe085d5963c3415d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. One prominent URL, https://maypoin.ru/strik?utm_term=insinkerator+555ss+gasket, suggests a lure related to product searches. ClamAV also detected this file as Pdf.Phishing.Trojan. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://maypoin.ru/strik?utm_term=insinkerator+555ss+gasket PDF link annotation
    • http://jizerigozigalav.getenjoyment.net/baritone_uke_chord_chart.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366978/normal_5ffe1907a1ae2.pdfIn PDF document text
    • https://pobokeriwefugo.weebly.com/uploads/1/3/5/3/135395193/88ad71a4d6e.pdfIn PDF document text
    • https://raxorevowipafe.weebly.com/uploads/1/3/4/7/134765671/tularuxuduxo.pdfIn PDF document text
    • https://bomejafir.weebly.com/uploads/1/3/4/7/134725936/7500622.pdfIn PDF document text
    • http://setafugeridol.scienceontheweb.net/engineering_mechanics_centroid_and_moment_of_inertia.pdfIn PDF document text
    • https://vivesajepud.weebly.com/uploads/1/3/0/9/130969004/bulifitenog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_6064348acc00b.pdfIn PDF document text
    • https://baneboveboxov.weebly.com/uploads/1/3/0/7/130775782/mirofe-lenolarirunar-wagivokipetat.pdfIn PDF document text
    • https://roribevewo.weebly.com/uploads/1/3/4/5/134502196/4080658.pdfIn PDF document text
    • https://fadatofi.weebly.com/uploads/1/3/1/3/131381363/binikenewidat_ligixebed_fewalevuwab.pdfIn PDF document text
    • https://nebakeji.weebly.com/uploads/1/3/4/6/134649015/228f7cfe.pdfIn PDF document text
    • http://sopesukenapad.scienceontheweb.net/centroid_of_all_shapes.pdfIn PDF document text
    • https://levarimabogi.weebly.com/uploads/1/3/5/3/135328943/17b4d3cae2b81.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422145/normal_600351d1508b5.pdfIn PDF document text
    • https://xitititoludazo.weebly.com/uploads/1/3/5/9/135987602/jezoz.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/jepinebawo/tutexirotasizulasun.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/concord_furnace_model_number_location.pdfIn PDF document text
    • https://s3.amazonaws.com/vufuzewasi/template_for_iphone_xr.pdfIn PDF document text
    • http://tifavamifikas.myartsonline.com/jobiregutibuzulonunaked.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1d82922-21a7-4c22-8eff-d6b8b37601ad/xosonekufuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78ce9e29-d0b1-4a8f-994f-b79b232da251/rarap.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/sedofobidibonotonizi.pdfIn PDF document text
    • https://s3.amazonaws.com/figidireki/refefopefifukovadenowevaz.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_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 4948 bytes
SHA-256: 6c95816d1a358302c7ce3b9a39e0744aa42e42a0f380af30994871b9f944aa9b
font_01_sfnt_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 11156 bytes
SHA-256: a44d152653d899b755cdbb8aac7e4db519cdf76544b390e3647de7847710d168

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