Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5aa656b79b0828…

MALICIOUS

PDF

96.5 KB Created: 2021-03-21 23:49:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c4609f9bd92921b9bea0a09b890a2faf SHA-1: b8e7ed6ee55dcf1c1b5c7dc27085b713302ddf43 SHA-256: 0f5aa656b79b08286ef39c2f7b8a4a60aae9189a7e60557d4ba00f3bb26a2afa
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded links point towards a phishing or malicious redirection scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://xezojetit.ru/award?keyword=anatomie+de+la+main+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419204/normal_602d47e00aca8.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/can_i_substitute_vinegar_for_keurig_descaling_solution.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478669/normal_600d00d33c8bf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_603eefe839aa0.pdfIn PDF document text
    • http://lenusabipowezo.getenjoyment.net/difference_between_conduction_convection_and_radiation.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/19123789739.pdfIn PDF document text
    • http://raxewaponoxiv.mygamesonline.org/drawing_human_anatomy_giovanni.pdfIn PDF document text
    • http://tigadugutuvatix.mygamesonline.org/xifoxivalopefuz.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/17317367186.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451047/normal_5fe30f3f60d29.pdfIn PDF document text
    • http://siviveko.getenjoyment.net/starbucks_barista_hourly_pay_texas.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8bd0dbf5-62e0-4684-a95a-1d9666dfa34a.filesusr.com/ugd/e71694_97fb8c3bce2d48d7849ebfa994ebce7c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/remavuj/flowers_for_algernon_theme_analysis.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/how_to_generate_extent_report_without_testng.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_0051b67d8d7f4017b3521286a0b61d88.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/anger_management_techniques.pdfIn PDF document text
    • https://s3.amazonaws.com/feseni/sewusi.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_faacf8caab4e47f0bc1d07833776428f.pdf?index=trueIn PDF document text
    • https://6478d21b-237c-41b5-add8-96d7b9819624.filesusr.com/ugd/c7ef1a_c8218c24d8414863a40cc90a6a67a8ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/karevino.pdfIn PDF document text
    • http://pikubub.onlinewebshop.net/48924615234.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_8e07eaa05dee44918e88057946edfd2d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/tugurebot.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_off000137ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137AD 4904 bytes
SHA-256: 508d881921a859b17b2d5525cf3ab42ad03ba6c681c9eb9742ba727574fdb939
font_01_sfnt_off00014852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14852 13720 bytes
SHA-256: 702216354e123a03e353f7ea849d213a3c0c313c600868df52660b8391160999

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