Malicious PDF — malware analysis report

Static analysis result for SHA-256 c283a6ba2caa1de4…

MALICIOUS

PDF

82.4 KB Created: 2021-03-14 02:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: c37ebcbeba2ef8d1a9d8cf530bb66a07 SHA-1: 15b36fcc8b5924481bd0787d3416af80eb55cdcb SHA-256: c283a6ba2caa1de452acd849071adadc19f6496b21c34d661c576f0dfd5ad784
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a 'PDF_SEO_LINK_FARM'. One of the primary URLs, 'https://resalured.ru/award?keyword=absceso+definicion+pdf', suggests a lure related to a medical definition. The presence of a large number of external links, including 'http://tudaket.epizy.com/jobupopew.pdf', indicates a potential attempt to distribute further malicious content or engage in SEO abuse. ClamAV detection as 'Pdf.Phishing.Trojan' further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=absceso+definicion+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4405953/normal_60264b0fa39a7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380527/normal_5feb2702802cc.pdfIn PDF document text
    • https://numeroluxovuz.weebly.com/uploads/1/3/4/7/134733954/5a92b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388613/normal_6005a2b778de2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389582/normal_5ff31803d3fef.pdfIn PDF document text
    • https://kesoxebexug.weebly.com/uploads/1/3/2/6/132681937/nisobufude.pdfIn PDF document text
    • https://lepatoketi.weebly.com/uploads/1/3/4/7/134732542/vadal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450250/normal_6015f28e1d2c2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401517/normal_604069c111ba0.pdfIn PDF document text
    • http://tesidakikize.iblogger.org/what_are_three_universal_logic_gates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375887/normal_5fe9e28595534.pdfIn PDF document text
    • https://tajuzoliv.weebly.com/uploads/1/3/4/3/134359899/sigetotizak.pdfIn PDF document text
    • https://cdn.sqhk.co/tatiwurixiwo/jPgf7gj/toyota_auris_hybrid_2010_manual.pdfIn PDF document text
    • https://finenomasawovep.weebly.com/uploads/1/3/1/4/131437785/xizavakogegobo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383565/normal_6020d411eb671.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383794/normal_5fd93e172eadc.pdfIn PDF document text
    • https://cdn.sqhk.co/lutumodigi/b76gg8I/homer_simpson_saw_game_answers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459788/normal_5fde32a50e7a1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459921/normal_5feb3509b546d.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tudaket.epizy.com/jobupopew.pdfIn PDF document text
    • http://jijojigig.epizy.com/mainframe_rexx_programming_guide.pdfIn PDF document text
    • http://giduzorim.epizy.com/xiguposuki.pdfIn PDF document text
    • http://napilidowolaro.rf.gd/ranesowotigumizutufom.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_off0000ecf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF5 4940 bytes
SHA-256: a0eb3dd707aa5312885fc8af56c70dc802a5a2380311ce9144d5bb2438959c06
font_01_sfnt_off0000fdda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDDA 12532 bytes
SHA-256: c9e9f474db6adb06b5c969c641bfc1bc590cc9a1da8314e1c85b529817a58d54
font_02_sfnt_off000126a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16204 bytes
SHA-256: 541fa2b6826b0add99b7d5a173ef1e6a5567607b5192f75b810eb17d6a563501

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